Scan with multiple filters in Dynamo DB
This is a basic example.
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technical
Uploading a file to S3 using PreSignedUrl with HttpClient
```csharp private static async Task UploadToS3(string filename, string preSignedUrl) { await using var fileStream = File.OpenRead(filename); var file...
Any CPU settings in Visual Studio sln content for Service Fabric service
Any CPU.ActiveCfg = Debug|Any CPU Any CPU.ActiveCfg = Debug|x64 Any CPU.ActiveCfg = Release|x64 x64.ActiveCfg = Debug|x64 x64.Build.0 = Debug|x64 ...
Service Fabric app health check
Add health check libraries
Fix Port number for Service Fabric ASP.NET Core on the local development machine
To do so, you need to fix the port number for your local machine. On other environments like Staging or Production, you can let the Service Fabric service de...
Service Fabric skeleton service
Visual Studio Template Skeleton
Deploy Service Fabric type when one of its services needs deletion
“Error Services must be explicitly deleted before removing their Service Types.”
Set Powershell Aliases for cross environment development
You can check where the powershell profile is by doing $profile.
Powershell tips
```csharp // list all environment variables gci env:* | sort-object name
Configuring Resharper’s javascript level for ECMAScript 2016
Go to Resharper Options > Code Editing > javascript > Inspection
make a file executable in bash
Add #!/bin/bash to the top of it. This is necessary for the “make it executable” part. Add lines that you’d normally type at the command line. … At th...
Fail the serverless deployment if any test fails
```bash #!/bin/bash
Asserting on Collelctions on NUnit
```csharp var names = new[] { “Sarah”, “Amrit”, “Amanda”, “Sarah” }; Assert.That(names, Has.Exactly(4).Items); // pass Assert.That(names, Is.Empty); // fail...
VS Code Shortcuts
✲: CTRL ⌘: CMD ❖: Windows ⌥: Option ⇧: Shift ↵: Enter
Online resources I come across while coding, reading, and thinking (if I do)
bestofjs The best of JavaScript, HTML and CSS filepond A flexible and fun JavaScript file upload library ...
Powershell tips
gci env:* | sort-object name
Deserializing yaml file in C#
Deserialize YAML
Print all environment variables in Azure DevOps pipeline
steps: – task: Bash@3 inputs: targetType: 'inline' script: 'env | sort'
Auto-increment counter in dynamodb
# cli example aws dynamodb update-item \ --table-name ProductCatalog \ --key '{"Id": { "N": "601" }}' \ --update-expression "SET Price = Price + ...
Cognito userpool as authorizer of your lambda in serverless
```yaml httpApi: authorizers: serviceAuthorizer: identitySource: $request.header.Authorization issueUrl: https://cognito-idp.${op...
My favourite Git commands
create a new branch git checkout -b /feature/postcode
Upload a file to S3 bucket using serverless lambda in C#
First, create a bucket in Cloudformation
Build CI/CD pipeline for serverless by using Github Action
You create a yaml file in .github/workflows directory. Very similar approach to other CI/CD pipelines like Azure DevOps. The order of the jobs was like this.
Online resources I come across while coding, reading, and thinking (if I do)
bestofjs The best of JavaScript, HTML and CSS filepond A flexible and fun JavaScript file upload library ...
Upload a file to S3 bucket using serverless lambda in C#
First, create a bucket in Cloudformation
Everything about defining functions in serverless.yaml
Simple function that simply has http event.
Consuming restful APIs in GoLang
I was given a docker compose file. I need to launch the docker in order to call the test apis.
Visual Studio shortcuts
Key Description alt + 🠕, alt + 🠗 jump to the next method ctrl + \, ctrl + e show error...
repositoryType parameter in Azure DevOps API
https://dev.azure.com/{organization}/{project}/_apis/build/definitions ?api-version=6.0 &repositoryId=xxxxxxxx-e419-4a62-ae1a-ff6f5b6053b1 &rep...
Google Docs Shortcuts
Paragraph formatting Increase paragraph indentation ⌘ + ] Decrease paragraph indentation ...
My favourite Libraries and Frameworks
favicon generator Favicon Generator, For Real. minimal-mistakes Jekyll theme for building a personal site, blog, p...
Copy all files in directory in C#
```csharp void Copy(string sourceDir, string targetDir) { Directory.CreateDirectory(targetDir);
Migrating all my writings to Github pages
Installations
Using Github APIs to pull posts and to convert them to blog posts
First, create a new personal access token to authenticate the api request. Otherwise, you will be hit by the rate limit.
Register all your services to IServiceCollection
Read json configuration file and assign the values to typed configuration object. Register services
Building a simple CLI
First, Install package.
Migrating all my writings to Github pages
Installations
Connecting to Service Bus from Azure DevOps Pipeline
Create an Azure AD application and principal Create a service connection in Azure DevOps. It’ll be Azure Resource Manager type connection and will have...
Getting started with Serverless framework in c#
npm i -g serverless
React Native TextInput
```javascript import { TextInput } from ‘react-native’;
Serverless Framework Deployment failing after deleting API Gateway on AWS
Now deployment fails with “ An error occurred while provisioning your stack: ApiGatewayDeployment1496768351111 - Invalid REST API identifier specified”.
Serverless CI/CD with AWS CodePipeline
Create a new pipeline
Provision S3 Bucket with serverless.yml
So, our solution (me and my friend. it’s two developer project), is get all the users from User Pool and save it as json blog on to S3 bucket. serverless.yml...
Provision DynamoDb with serverless.yml
More details to here: https://www.serverless.com/dynamodb
Managing certificate to publish an iOS app
Create a certificate Create a profile Download the certificate from your developer account
Sql queries I use for SQLite
Case insensitivity in SQLite
Retrieving Topics and Subscriptions from Azure Service Bus
```csharp var managementClient = new ManagementClient(_configs.ServiceBusConnectionString); var topics = new List();
Sending a ServiceBus message in an integrated test
What to test for integration testing?
Handling files in c#
search subdirectories recursively
Powershell tips
gci env:* | sort-object name
Learning Go through a course in Coursera
Recently, my friend, Eduard, suggested learning Golang. Go is an interesting language with powerful low-level features like pointer but also with modern lang...
VS Code Shortcuts
alt + shft + mouse column select ctrl + ` show terminal window f12 g...
Windows Explorer Keyboard Shortcuts
Command Shortcut Go Back Alt + Left Go Forward Alt + Right Select the...
Rider keyboard shortcuts
Command Shortcut Add selection to the next occurrence ⌥⇧. Go to the previous place ⌘[ ...
Setting up Go environment
Go programs are organised into packages.
Moving blog engine to Hugo
I used brew to install hugo.
Upload and download file to and from Storage account
dotnet add Microsoft.Azure.Storage.Blob
Using dapper with sqlite
Connection strings
My favourite Libraries and Frameworks
scriban A fast, powerful, safe and lightweight scripting language and engine for .NET screenity The most powerful ...
Packing in Nuget
Recently, I came across an error, ‘DomainEvents.AttributesPackage 1.0.55’. You are trying to install this package into a project that targets ‘Unsupported,Ve...
Templating with scriban
Simply create a template and pass data object as parameter.
Nightly batch run on Azure DevOps Pipeline
My choice of solution is
Programatically create wiki pages on Azure DevOps
It has a handy client library: https://docs.microsoft.com/en-us/azure/devops/integrate/get-started/client-libraries/samples?view=azure-devops
Create a nuget package and publish it to Azure Devops Repository
So an idea came up. Decorate your C# domain event class with “DomainEvent” attribute. Write a tool that parse the decorated the class and generate markdown f...
Calling Azure DevOps APIs
.NET Client libraries
Build a React app with Azure Devops Pipeline
Create a new pipeline by clicking “New pipeline” I chose “Azure Repos Git”
Azure DevOps Wiki Syntax
Advanced usage: https://docs.microsoft.com/en-us/azure/devops/project/wiki/wiki-markdown-guidance?view=azure-devops
Create a lambda function that’s called on AWS SNS topic message
Let’s create a function that subscribes to a SNS topic
Conditional Build on Azure Devops Pipeline
The first step is to add a test on the buld. It didn’t have any build trigger. So I added it.
Build and deploy a full-stack react app on AWS
Created a new react app first.
Using reflection
Recently, I have worked on a tool that scan c# assemblies to discover domain events. Those event classes are decorated with [DomainEvent], so the tool search...
Visual Studio shortcuts
Key Description ctrl + \, ctrl + e show error list window
Using Amplify CLI
To install the CLI
error listen EADDRINUSE address already in use 8081
```bash lsof -i :8081 ...
React Navigation in my code
Create a mother Stack that hosts all other Stacks Create AppContainer that contains the stack
Calling the parent’s function from a child component in React
To show and hide an element in react is really simple.
Setting up my Mac
Shell
C# LINQ in the wild
Find the duplicates in the list
LED Tube lamp
https://www.screwfix.com/p/philips-g13-t8-led-tube-1600lm-16w-1200mm/7258v
git credential manager
I was pushing my commit to Azure DevOps git repo and it asked me my credential. I did and then it asked me again when I pushed my next commit. It kept asking...
iPhone Simulator shortcuts
Key Description ESC Dismiss ⌘R Reload ⌥⌘C Copy ⌘...
Your Mac was unable to communicate with your Apple Watch
Btw, to fix the issue, you have to
NET Core Service Registrations
To do it, you would need to
Documenting Domain Events automatically
Each team that manage a domain is supposed to document any events they publish to the Service Bus. My concern was the integrity of the documentation. It’s no...
Application Insight on Service Fabric Worker Process
Install Microsoft Extensions Logging packages Add Application Insights Telemetery Worker Service to your services collection Add logging filter manual...
Terraform Azure Function App
providers.tf: put cloud provider and version constraint variables.tf: any passed variables <resource>.tf: any resource I want to create. In this...
Azure Blob storage in 3 different tiers
Hot - Optimized for storing data that is access frequently Cool - Optimised for storing data infrequently accessed and stored for at least 30 days Arc...
Prettify JSON with C#
Interestingly, JSON.Net supported the feature already. The following’s the code.
Encrypt a sensitive information with Azure Key Vault
Things Azure Key Vault protects
Provision Azure Storage with Terraform
```bash resource “azurerm_resource_group” “events_rg” { name = “${var.organisation}-${var.system}-${var.environment}-events-${var.location}” location...
My favourite Git commands
create a new branch git checkout -b /feature/postcode
Managed Identity @ Azure
The managed identities for Azure resources feature in Azure Active Directory (Azure AD) solves this problem. The feature provides Azure services with an auto...
Encryption and Hashing
Hashing
Provision Azure Key Vault with Terraform
Azure Key Vault
Typed Configuration in ASP.NET Core
```csharp public class KeyVaultOptions { public string TenantId { get; set; } public string ClientId { get; set; } public string ClientSecret { g...
VS Code Keyboard Shortcuts
alt + shft + mouse column select ctrl + ` show terminal window F12 go to the definition ...
Encrypt a sensitive information with Azure Key Vault
Things Azure Key Vault protects
Creating a test Subscription to Azure Service Bus Topic
To solve the issue, I create another subscription, “*-test”. It’ll be only created when the service runs in Debug mode on a local development machine.
Adding a custom endpoint to AWS Amplify API
I’ve added the existing custom api endpoint to the config file
ASP.NET MVC Custom Action Filters
We need to log all user activities for enhanced security monitoring. in ASP.NET core, I would be using a custom middleware. A similar thing for MVC is Action...
React Native TextInput
```javascript import { TextInput } from ‘react-native’;
Windows 10 Tips and Tricks
Pin a file to the Start Menu
Killing a Process in Windows 10
Open the powershell prompt. I use Windows Terminal Type tasklist to see the list of all running processes and their PIDs. You can use a pipe with the mo...
How I’m setting my Windows developer machine
Microsoft Teams for chats
Access HttpContext inside a service
Controllers expose the ControllerBase.HttpContext property
QueryString in the Stylesheet’s href
<link rel="stylesheet" href="css/style.css?v=1">
Handy apps for Mac
cmd + tab to switch to another window Use rectangle to manage windows. AppCleaner to uninstall apps Weather bug to show weather on the top bar its...
Read settings json file from the parent directory of “bin” in Azure Function app
Publish appsettings.json
List active (pending) Pull Requests on Microsoft Teams chat room
My Acceptance Criteria
Fail the deserializatioin of JSON string if any expected properties don’t exist
Json.NET has another handy attribute, [JsonObject(ItemRequired = Required.Always)]. It makes every property of the class mandatory
Generating a new blog post with a markdown file
These are the packages I used to make it happen.
Serialize and deserialize enum as string with System.Text.Json
A few different wasy to achive the same goal. For more comprehensive documentation, refer to JSON in .NET.
Generating a new blog post with a markdown file
file system: https://nodejs.org/api/fs.html, to create a file fs-extra: https://github.com/jprichardson/node-fs-extra, handy functions with file system ...
List active (pending) Pull Requests on Microsoft Teams chat room
My Acceptance Criteria
Setting Windows Terminal Starting Directory
Via Windows Package Manager CLI (aka winget)
Global error handling in ASP.NET Core web APIs
```csharp public async Task Create(LedgerTransaction transaction) { _logger.LogInformation($"Saving a transaction: {transaction.TransactionId}");
Mocking Cosmos Container method for unit testing
```csharp private readonly TestApplicationFactory _factory; private readonly ITestOutputHelper _output; private readonly HttpClient _client; private readonly...
Azure Cosmos DB performance tips
For query-intensive workloads, use Windows 64-bit
Azure Cosmos DB performance tips
For query-intensive workloads, use Windows 64-bit
Send message to a Teams’ channel
We started posting pending PRs in the group chat. Soon, it became a chore. So I thought we could automate it by scripting it.
Protect an API endpoint with usage plan on AWS
Recently, we received a new business requirement that another central system needs to access the backend and update the warranty information. The system will...
Using TimeSpan configuration values in .NET Core
"CosmosDb": { "ConnectionString": "AccountEndpoint=#{cosmos_db_endpoint}#;AccountKey=#{cosmos_db_primary_master_key}#;", "MaxRetryAttemptsOnRateLimitedRe...
Component testing in ASP.NET Core
```bash Component Test Coverage
Service Fabric app health check
Add health check libraries
Easy way to compare the values of the two complex objects
```csharp public static bool ValueEqual<T1, T2>(T1 expected, T2 actual) { var expectedValues = JsonConvert.SerializeObject(expected); var actua...
Any CPU settings in Visual Studio sln content for Service Fabric service
Any CPU.ActiveCfg = Debug|Any CPU Any CPU.ActiveCfg = Debug|x64 Any CPU.ActiveCfg = Release|x64 x64.ActiveCfg = Debug|x64 x64.Build.0 = Debug|x64 ...
Cosmos Emulator for local development and testing
Download it from https://aka.ms/cosmosdb-emulator
Logging in ASP.NET Core APIs and services
# for class library Microsoft.Extensions.Logging.Abstractions
Calling api endpoints with Refit
The automatic type-safe REST library for .NET Core, Xamarin and .NET. Heavily inspired by Square’s Retrofit library, Refit turns your REST API into a live...
Logging onto Application Insights from ASP.NET Core api service
Install Microsoft.ApplicationInsights.AspNetCore package
I exists ‘cause I write
My name is Young Ho Chaa (Andrew Chaa). I’m originally from South Korea and have been in the UK for 20+ years. Currently, I work for Clear Bank as Principal ...
Calling an API with redux saga
Install the packages
Calling the parent’s function from a child component in React
To show and hide an element in react is really simple.
Fix Port number for Service Fabric ASP.NET Core on the local development machine
To do so, you need to fix the port number for your local machine. On other environments like Staging or Production, you can let the Service Fabric service de...
Logging on AWS Lambda with .NET Core
The easiest way to output logs from the function code is using the Console class or LambdaLogger clas that writes to stdout / stderr.
Service Fabric skeleton service
Visual Studio Template Skeleton
Deploy Service Fabric type when one of its services needs deletion
“Error Services must be explicitly deleted before removing their Service Types.”
Static website hosting in Azure Blob Storage
Setting up
Programming
False alarm from bots
I'm on call this week, and whenever there's alert, it comes to my mobile. I've had Error rate > 5% alert from PagerDuty the other day. I've acknowledged t...
Dictionary.Insert Null reference error
최근에 OAuth를 이용한 로그인 시스템을 구현하면서 login client를 NuGet Package로 만들었었다. 다른 개발자들이 쉽게 로그인 기능을 이용할 수 있도록. 그런데 자꾸만 acquired token을 저장하는 static Dicionary에서 Null Referen...
C#’s async, await, and .Result
In Market Invoice, there are many places where async and await are used. Recently, I introduced a bug that an operation gets deadlocked by replacing await wi...
Test Data Builder with Fluent lambda interface
With the builder pattern, you can create an object in a more flexible and explicit way. And C# lamdba syntax makes the fluent interface more succinct For exa...
Inverting the direction of mouse scroll wheel in Windows
Why would you do that? It's because since in Mac OS X Lion, they've reversed the wheel scroll direction. I've always reversed it back in system preference. T...
Reactive Extensions, to write async, event-based programs with observables
Hello World in Reactive way Reactive Programming is "a programming paradigm oriented around data flows and the propagation of change" (wikipedia) With Reacti...
git cherry-pick
Git commit's id is a hash of its contents and its history, and becomes a unique id for a specific commit. Even if it contains the same change, as the parent ...
이민, 새로운 기회와 도전
"당신의 미국 이민이 망하는 다섯 가지 이유" 제목의 슬로우 뉴스 기사를 트위터를 통해 접하고는 잠깐 "광분" 했었다. 그럴꺼 까지는 없었는데. 문든 옛 생각이 났다. 대학원 가기 전, 준비를 위해 석사 1년차이던 선배에게 조언을 구했던 일이. 선배의 답변에 너무 놀랬었다. "야 ...
NuGet restore
NuGet is a package manager like NPM for node.js or Gem for Ruby, and it is a dominant one in .NET. You can handle dependency packages in two ways. You downlo...
Posh Git shows the current branch and the state of files in powershell prompt
It's a set of PowerShell scripts that gives Git integration in PowerShell prompt. https://github.com/dahlbyk/posh-git The first thing you notice once you ins...
Node.js의 힘, npm
Node.js, 이제는 모르는 사람이 없는 서버쪽 자바 스크립트 프로그래밍 언어 및 환경. 작년부터 Node.js를 개인 프로젝트에 조금씩 써보다가 이제는 거기에 꽂혀서 모든 개인 프로젝트를 Node.js로 하고 있다. 그런데 계속 쓰다보니, 이 npm이란 놈이 여간 기특하지 않은...
The rising tide of shipping glitter bombs
It seems that people are suddenly mad with the sweet revenge of bombing people with glitter. Shipping enemies glitter is becoming world-wide phenomenon. This...
Sacrifice is noble, but what if the cause is not clear?
I saw American Sniper last week. Undoubtedly, it's a great film to watch and it was heroic for Kyle to guard his fellow soldiers against the attack from the ...
birdman and becoming polyglot
Birdman is an American black comdy that features a faded Hollywood actor famous for his superhero role. While seeing the film, I kind of thought I have somet...
Opening an office document from Code
It's a simple job at a glance, and it should be. But we had a bug with that feature. You open a document on Huddle and it should be opened in an application ...
SRP (Single Responsibility) and encapsulation
Single Responsibility is one of key principles in writing good code, I believe. So when you change a method or a class, you should have only one reason to ch...
요즘 근황 (2014. 11월)
며칠전에 Skype 채용 담당자로부터 메일이 왔다. Skype Web App 팀에서 사람을 구하고 있다고. 지금 회사인 Huddle도 마음에 들지만, 양파님의 블로그 글을 읽다보니 웬지 Skype에 가볼까 하는 생각도 생긴다. 근데 웬지 마소는 좀 지는 해 같아서. 이번에 구조 조...
A simple script that cleans and builds visual studio solution with psake
psake is a simple build automation tool written in powershell, and works well on Microsoft platform. This is a really simple example that cleans bin folder, ...
Adding facebook login to my own website
The official document (https://developers.facebook.com/docs/facebook-login/login-flow-for-web) is the best tutorial. But when you follow it, there's a few th...
when windows 7 usb download tool fails to copy files
http://4sysops.com/archives/windows-7-usbdvd-download-tool-wudt-is-unable-to-copy-files/ diskpart's "clean" command is the key.
London Bus
Recently, I'm playing with TFS's countdown apis. As I am a bus commuter, I use bus arrival check app everyday. There are free and paid apps on iPhone and my ...
Customising Mac’s terminal prompt
You can colourise it, if you want. Open .bash_profile in your editor (I used sublime) [sourcecode language="bash"] sublime .bash_profile [/sourcecode] Add th...
Change Mac’s Computer name
Launch ‘System Preferences’ Click the ‘Sharing’ icon Type in what you want your Mac’s new computer name to be Close ‘System Preferences’
Skipping IIS Custom Error pages
By default, IIS7 intercepts 4xx and 5xx status responses with its own custom error pages. At work, we have a custom redirection module that checks if the sta...
MS Build - Publish to FileSystem
I'm working for a simple project and wanted to deploy it to the webserver in my church. I installed TeamCity and set it up to pull the source code from githu...
a few things I learned in 3 hour python hacking
I don't usually use python. My daily language is C#, so it was a nice, refreshing time to code in python. A couple of weeks ago, I wrote a small plug in with...
Catch multiple Exceptions at one go
It is not a good practice to catch System.Exception, as the catch block will be executed with unexpected exceptions and it will hide the real error. But some...
display currently running application pools with appcmd list wp
When you try to debug your website locally, often Visual Studio shows more than one w3p.exe processes, if you run multiple application pools. Attaching to al...
Veryfying the key and value of the dictionary passed as parameter with Moq.It
In unit-tests, you mock out external dependencies. With Mock framework, you can verify that a correct value is passed into the dependency. Today, I had a cas...
My Favourite Visual Studio Shortcuts
Actually, this includes ReSharper shortcuts as well. Visual Studio & ReSharper CTRL + SHFT + N: Go to a file (ReSharper IDEA shortcut) CTRL + -: Go to a...
Ninjecting ASP.NET MVC 4 Web Api
Injecting dependencies into ASP.NET MVC controllers is straightforward with Ninject. Just install Ninject and Ninject.MVC3 via nuget. It will create a file "...
JWT - JSON Web Token
JWT is JWT (JSON Web Token) is "a compact URL-safe means of representing claims to be transferred between two parties," by its definition. (http://self-issue...
Use mspec-clr4.exe for .NET 4 assemblies
Otherwise, you get an error like 19/03/2013 14:31:39: An Error Occurred: Exec: Error executing command & $mspecPath @(dir "$buildFolder\*Tests*\*Tests*.d...
error CS0227: Unsafe code may only appear if compiling with /unsafe
This is the error message you get, when you build a project with some bit of unsafe code in it. Simply you need to "Alt + Enter" on the project to see the pr...
Update a column with Case statement
It's handy syntax. just a reminder for myself, as I don't use sql often. [sourcecode language="sql"] UPDATE [SiteUsr] SET HashAlgorithm = CASE WHEN LEN...
Sending errors in a roll up digest email with log4net
On production, there are many alerts in a short period. It's nice to get error emails, but you would want to avoid receiving hundreds of emails in a few minu...
Converting SqlDataReader’s value to C# types
I spent another day working with SqlDataReader, and actually I enjoyed it. It's pure geek joy to learn a new thing a day. With SqlDataReader, you get the va...
IDataReader’s GetInt32() and GetOrdinal(), and performance
Yesterday, I came across a code that simply pulls data with DataReader. These days, you would usually use NHibernate, Entity Framework, or whatever you like ...
Writing a powershell cmdlet…
A cmdlet (reads "command-lit") is a lightweight command used in Powershell environment. The Powershell runtime invokes cmdlets within the context of automati...
Use transactions for select statements
Transactions are usually when you have insert, update or delete statements with the "atomic" behaviour. However, in a highly concurrent application, it could...
Indexing CreatedDate
Indexing columns is a joy and adventure. I have just indexed a datetime column to boost performance. The query had a date range, and the column didn't have i...
Add paypal buy now button on the web site - draft
I'm working on the website of a restaurant that Sue's friend owns. Recently, her friend wanted to add online order feature, and her preferred payment method ...
Crystal Methodology - draft
"Methodology" is even hard to spell. Initially, I wrote "Methodoligy" and soon noticed something was wrong. Crystal is a methodology introduced by Cockburn. ...
Authenticating your api call - draft
Security matters, and you need to authenticate your api calls. There are a few ways to do it. You can insert authentication cookie into the http header of yo...
About WPF RichTextBox
This content is moved from Console+ post, as I use Avalon Text Editor, not RichTextBox, for the project. It's an interesting control. Because now I can read ...
Load Testing a Website
What is Load Testing? Load testing is the process of putting demand on a system or device and measuring its response. Load testing is performed to determine...
Huddle에 오게되어 감사
Huddle에서 일하기 시작한지도 벌써 4개월째이다. Start-up에서 시작했지만, 지금은 꽤 규모도 커졌고, funding도 많이 받아서 이제는 어느 정도 궤도에 올라선 것 같다. 하지만, 자유로운 분위기, 주식을 직원들에게 나눠 주는점, 과감한 기술 투자 등의 Start-up...
Webdriver tips
Webdriver is still a useful testing framework, thought phantom.js may be a better fit for javascript-intensive for SPA(Single Page Application). The below ar...
Building Console+, an enhanced (hopefully) interface to windows shells
Everyday, almost, I use three different shells, Command Prompt, PowerShell, and Bash for Git. I think the interface of those shells has lots to improve. As I...
Unlocking Blackberry bold
It seems Blackberry is the coolest phone among secondary school kids. My daughter has longed for it for long time, and finally got it from my wife's friend. ...
Powershell and me
It's an interesting scripting language. Well, scripting has been for a long time in *nix systems, and I feel it's quite late that Windows catch up now. But s...
Updating NHibernate version
I'm updating NHibernate version of a project and comes across a few errors. NHibernate.ISession' does not contain a definition for 'Linq' It seems session.Li...
About Semantic Versioning…
http://semver.org/ cool practice to manage your version consistently.
NuGet basics
The definitive documentation is nuget.org. If you are a console person and don't like nody UI stuff, you can use the Package Manager Console. I am a NuGet us...
Convert a text document with korean character set to unicode utf-8
I'm working on a Korean website. It's about zen breathing and meditation. So, I have all the documents I want to upload. I read them from the file and displa...
making bootable usb with ms-dos or ubuntu linux to check hard drive failure on the laptop
Quite descriptive title. My friend had a laptop failure. It has windows 7 installed, but it didn't boot. I tried to boot in safe mode, but it still failed. I...
programming in java after 10 years of break
I learned java at Uni. and worked really hard. Yet, I didn't have chance to use it when I becaue a full time programmer. I was a Delphi and VB guy and then C...
Team City Basics
This post is about the way I use TeamCity and would not be completed for the time being. Checkout rules you make checkout path to map to different path. For ...
Reading Kent Beck’s “Test-Driven Development By Example”
This is my third time read. When I read it first time, I didn't know much of TDD and wanted to grasp its concept. Now, it's been several years since I learne...
Jumploader - Java File Upload Applet
JumpLoader is a Java applet designed to upload files from the client to a server. Well, I know this is the age of HTML5 and you are not cool if you don’t use...
list of javascript quirks
This post is to remind myself of mistakes I did or encountered with javascript. Do not use window.location.origin It is undefined in Firefox currently (ver. ...
Debugging with Fiddler
Setup Well, download Fiddler first by visiting http://www.fiddler2.com/fiddler2/version.asp. Use BeyondCompare to compare web sessions Everyone loves ...
my favourite (?) HTTP status codes
Sourced from Wikipedia - List of HTTP Status Code 401 Unauthorized Similar to 403 Forbidden, but specifically for use when authentication is required and ...
Remove the annoying certificate error page when running selenium tests
Selenium and webdriver tests are everywhere these days. They can be often slow and flaky, but you need to run them to make sure you didn't break anything. cf...
Open sublime text 2 from command line on windows
In Mac, you can open sublime text 2 from terminal, and it’s really handy. I wanted to replicate the same thing on windows, so wrote a simple script that enab...
Powershell script tips
Write to a file Use Set-Content and Add-Content Set-Content Add-Content [sourcecode language="bash"] Set-Content "C:\Program Files\Sublime Text 2\subl...
windows batch file tips
using batch parameter comprehensive documentation [sourcecode language="bash"] @echo off sublime_text.exe %1 [/sourcecode] hide output and output only the ...
Don’t use string concatenation for JSON string, use JSON.stringify()
As javascript newbie, this is what I did. [sourcecode language="javascript"] return '{"Data" : ' + '{' + '"uid" : "' + this.uid...
SVN tips
SVN has been useful source control, though recently people go for git or mercurial for its disconnected manner. I am git/hg convert too, but you know, you ca...
my jQuery tips
A collection of jQuery examples and tips adding background image to an element [sourcecode language="javascript"] <script type="text/javascript"...
About Castle Windsor Container
Since I moved to Huddle, I am using Castle Windsor. This post is the summary of what I would learn while using Castle Windsor. the source code I don't know w...
What I learned while updating my church website
Working on a person project is lots of fun. You have a whole control over your project, what to do, how to do, and when to do. Also, it gives an opportunity ...
Disable browser cache for ajax request on ASP.NET MVC
The application reloads the list of jobs, if any job is reposted or expired. We display different labels, such as "reposted", "expired", depending on the act...
rails generate basics
create controller with help and home routes [sourcecode language="bash"] $ rails generate controller StaticPages home help --no-test-framework [/sourcecode] ...
rake basics
Rake is ruby make, a make-like language in ruby. make has been used to build code in linux & unit environment. [sourcecode language="bash"] $ bundle exec...
git tips
I have used git for a year now on my personal projects, but it's still mysterious. I feel like I need a good gui like TortoiseHG. Probably Git Extension is t...
Visual Studio 2010 Command Prompt Here On the Context Menu of Windows Explorer
You use keyboards and command line more and more, as you get more experienced with the tools in development. If you install git on windows, it creates "Git b...
The benefits of simple, automated performance testing by Kristoffer Dyrkorn
It is so good that all those videos are published after conference. If you are not a speaker at the conference, not sponsored by your company, or not have a ...
Handling Sandwich Code in C#
What is "Sandwich Code"? I found it in Ruby Koans. Often, you have to do something at the beginning and at the end, even though your main lock is in the midd...
My favourite helpers for ASP.NET MVC
As you use ASP.NET MVC on and on, you start building and using handy html helpers. Rob Conery posted a few of his helpers on his blog. You can find some more...
Testing private method in unit testing
Ideally, it is not recommended to test private methods, as complex internals should be kept hidden and only interface be tested. Well, in real world, sometim...
Outputting to pdf using iTextSharp
Recently, I moved to Barclays. My job is still development, though. Totaljobs is a good company, and I enjoyed its casual, IT geek culture. It's the thing I ...
Pulling records from a referenced table using Entity Framework
Strangely, most of Entity Framework examples are for just one table. In real world, it is very rare, unless you use some document database. Often you get a r...
Using NHibernate, Sqlite in your ASP.Net MVC project
I used Entity Framework for my personal projects for a while but wanted to try NHibernate. Instead of NUnit, I tried MS Test this time. First problem was tha...
Deploying Sqlite together with ASP.Net MVC and Entity Framework
Of course, you need to install sqlite or deploy the dll together. Yet I keep forgetting that I need to register ".Net Framework Data Provider for Sqlite" You...
Recycling IIS application pools and COM+ programmatically in C#
These days, I work on projects that is based on Sitecore CMS. Sitecore caches everything, so if you make any changes to your code, the web page does not refl...
To get started with ASP.Net MVC 2
I work on a few personal projects. Personal projects are fun, because you can choose which technology and tools you are going to use and often you can experi...
lots of microsoft windows communication foundation webcasts
http://www.dasblonde.net/2007/06/24/WCFWebcastSeries.aspx http://social.msdn.microsoft.com/Forums/en-US/wcf/thread/362aaaf6-8eda-4fff-8e4c-8198e3f327f
Use Sqlite together wtih ASP.Net MVC
Visual Studio 2008 integrates Sql server 2008 express nicely into App_Data folder. You just create the database using Server Explorer, and it inserts the con...
google’s canonical link
You can come to a same page with the same or similar content with many different urls. Query strings may have user id, session id, and many more. All these v...
Display Selected value with Html.DropDownList in ASP.Net MVC
I wrote ToastManager about two months ago, and not try to covert it into ASP.Net. What ToastManager does is to collect people's toast order for the morning t...
File is rejected by a third-party system, when it is utf-8 encoded with BOM
Recently, I had a chance to refactor codes for a system that sends a file to DreamMail. Because we did not touch any FTP functionality, we were complacent an...
How to use html test suite and cases on Selenium RC
References How to install and use Selenium RC http://www.jroller.com/selenium/ Very good and complete article on introduction. Selenium Core FAQ Selenium RC...
Keeping site root url clean without query string
References ASP.Net Cookies Overview Adding parameters to query string at run time Reflection Binding Flags Enumeration .Net reflector SEO is becoming more ...
Adding a “Open the containing folder” command to Visual Studio.Net 2003
Resources Yahoo VS.Net add-on group: http://tech.groups.yahoo.com/group/vsnetaddin/ Visual Studio.Net Add-on samples: http://www.microsoft.com/downloads/det...
Creating an IIS website change deployment script
Often, I need to deploy an website change to a production server. It can be a simple change like creating a virtual directory and rather rarely very big like...
Visual Studio Add-in: Recycle all IIS application pools on build done
related post: http://simplelifeuk.wordpress.com/2007/10/05/writing-a-visual-studionet-2003-add-in/ resources http://www.koders.com/csharp/fidA05F9CFC9911DC9...
Regular expression tips
There are several regular expression I use more often than I thought. This will be a comprehensive list of those expressions. Get file extension Useful if yo...
MSBUild task: Get the latest code from TFS and build
Resource TFS command-line help: http://blogs.msdn.com/noahc/archive/2007/01/22/real-tfs-command-line-help.aspx SDC Tasks: http://www.codeplex.com/sdctasks r...
add a reference to assembly ‘System.Web.Extensions…
I was adding a ajax-enabled control on a page and suddenly having "... You must add a reference to assembly 'System.Web.Extensions..." error. It complained t...
Specify .net version for COM+ components (dllhost.exe)
Last Thursday (13/11/2008), I reinstalled Visual Studio 2008 and sudeenly, all data access layer components which were COM+ did not work. WIth the help of ot...
When to use static methods?
This is a question that hanuts me since I installed Resharper recently. Resharper keeps suggesting that the method can be static. I can see that it can be st...
Install website in IIS using vbscript
Reference Script Repository: IIS 6.0 Enumerate IIS Virtual Directories using WMI in VBScript HOWTO: Enumerate IIS website and ftpsite configuration (VBScrip...
CS1595 ‘…’ is defined in multiple places error when you use a user control
CS1595: '_ASP.FormsLoginPart_ascx' is defined in multiple places; using definition from 'c:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\Temporary ASP.NET Files...
programming
Outbox Pattern in API and Messaging
Outbox is a simple relational database table that temporarily store all the events the service raises.
Strongly Typed Identifier
GUID or UUID is the almost standard identifier for entity objects these days. It used be INT and I still do love INT as id type, but the trend is GUID.
Installing Ubuntu on Windows 10
It’s really nice that I can use linux shell on windows. One of big part of me using MacBook was to have linux / unix-like shell and development environment.
Unit Testing With ASP.NET Core
It’s important that your unit test run against public interface of module. Otherwise, you do not test behaviour but your implementation of the behaviour. In ...
Get last item from List in F#
In C#, you use bang (!) to negate a boolean expression. Unfortunately, not in F#. it’s “not”
Fix ASP.NET Core port number on Service Fabric
If you create a stateless asp.net core api as service fabric service, the port number changes each time you restart the service fabric service. It’s quite an...
Configuration in ASP.NET Core
When you create stateless service fabric asp.net core api, the template doesn’t add configuration builder by default. I’ve spent about an hour pulling my hai...
A journey into ASP.NET Core CORS (Cross Origin Resource Sharing)
A quick note. I may turn this into a proper blog post.
Nginx as Reverse proxy for ASP.NET Core on Local Windows machine
NginX is a basket full of interesting features, but here, I’ll focus on using it as reverse proxy.
HATEOAS RESTful service
HATEOAS stands for Hypermedia as the Engine of Application State. It's a concept I encountered about 5 years ago, in an after work technical talk that was he...
general
아프면 쉴 수 있는 삶
지난 주말에 아는 후배가 직장 잡는 걸 도와주기 위해 토일 이틀에 걸쳐 skype로 pair programming을 했었다. 토요일 오후 2시에 시작해서 저녁 11시 30분에 끝나고, 일요일 오후 4시즈음에 시작해 저녁 8시 30분 정도에 끝났으니, 아주 빡세게 달린셈이다. 그랬더...
Dovonshire House, 공부방
음 난 내성적인 편이다. 그러면서도 결혼해서 애들은 셋이나 있으면서 북적 북적 사는 내가 대견하다 ^^. 어쨋든 성격때문에, 사람들에게 치인 마음을 추스리려면 조용한 혹은 조용하지 않더라도 타인을 전혜 신경쓸 필요가 없는 그런 공간이 자주 필요한데, 그럴때면, laptop을 들고 ...
The first post
This is my first markdown post. Will it be easy if I write on local machine, rather than on Wordpress page? Not sure, but honestly, wordpress.com needs to im...
Hello World!
dbyll is minimalist, stylish theme for jekyll. Supports gravatar, account links (github, twitter, e-mail, pinterest, résume file) and a bio.
Configuration
In your config file change these settings
Sample
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis no...
Sample 2
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis...
life
Snowy, our beloved cat
This is a reminder for myself not to forget snowy's details Flea medicine: Frontline Combo Spot-On Cat Worming: Drontal
South Korean flag in magnet
We, in Totaljobs, use Scrum, and as you know, a big whiteboard, paper card, and magnets are essential tools for Scrum. When the end of sprint is approaching,...
Paul Hong 선교사님의 영어공부 비법 3가지
여러가지 비법이 있을 수 있지만, Paul Hong 선교사님이 자신의 체험을 바탕으로 한 영어 잘하기 비법 3가지를 공개하셨다. 이 세가지 비법이 가진 강점은 본인이 직접 실행하여 그 효과를 체험하였다는 것. 영어 공부의 목적이 "영어를 쓰는 사람들을 사랑하기 위한 것" 이 되어...
Paul Hong 선교사님의 영어공부 비법 3가지
여러가지 비법이 있을 수 있지만, Paul Hong 선교사님이 자신의 체험을 바탕으로 한 영어 잘하기 비법 3가지를 공개하셨다. 이 세가지 비법이 가진 강점은 본인이 직접 실행하여 그 효과를 체험하였다는 것. 영어 공부의 목적이 "영어를 쓰는 사람들을 사랑하기 위한 것" 이 되어...
Joel’s first passport
Susanna가 갑자기 한국에 가게 되어서 조엘이의 British Passport를 신청하고 있다. Check and Send service 를 이용하면 약 2주 안에 받을 수 있다. 신청할 수 있는 Post office는 POST OFFICE LTD MEDIA VILLAGE SP...
영국에서 개발자로 일한다는 것은…
옛날에 마소에 기고했던 글인데 인터넷에 pdf 파일이 떠돌기에 아예 내 블로그에 올려버렸다. 마침 동아일보의 손영일 기자님과 우연한 기회에 인터뷰도 하게되기도 했고. 영국에서 개발자로 살기 Part I 영국에서 개발자로 살기 Part II
Blog
Post: Link Permalink
This theme supports link posts, made famous by John Gruber. To use, just add link: http://url-you-want-linked to the post’s YAML front matter and you’re done.
Post: Quote
Only one thing is impossible for God: To find any sense in any copyright law on the planet. Mark Twain
Post: Notice
A notice displays information that explains nearby content. Often used to call attention to a particular detail.
Post: Chat
Abbott: Strange as it may seem, they give ball players nowadays very peculiar names.
Post: Standard
All children, except one, grow up. They soon know that they will grow up, and the way Wendy knew was this. One day when she was two years old she was playing...
Post: Modified Date
This post has been updated and should show a modified date if used in a layout.
demo
Hello World!
dbyll is minimalist, stylish theme for jekyll. Supports gravatar, account links (github, twitter, e-mail, pinterest, résume file) and a bio.
Configuration
In your config file change these settings
Sample
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis no...
Sample 2
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis...
setup
Hello World!
dbyll is minimalist, stylish theme for jekyll. Supports gravatar, account links (github, twitter, e-mail, pinterest, résume file) and a bio.
Configuration
In your config file change these settings
PC
“the file cannot be accessed by the system” after deleting windows home server
Honestly I panicked when I tried to open a text file and found that I could not open the file nor copy it. I installed Windows Home Server. I liked the simpl...
sample
Sample 2
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis...
blog
Welcome to Jekyll!
You’ll find this post in your _posts directory. Go ahead and edit it and re-build the site to see your changes. You can rebuild the site in many different wa...
tools
Visualize your dependeicnes with graphviz
Graphviz use simple markdown-like syntax to draw complex graphs. Initially I tried mermaid but it was more for flowchart, where things flow in one way. Graph...