C# (Csharp) Switch Case Statement with Example

A C# switch case statement defines multiple groups of statements, and then executes one of these statement; depending on the value of a constant or test expression.

Let us understand this concept with an example.

string siteName = "DevCurry";
switch (siteName) {
    case "DotNetCurry":
    Console.WriteLine("This website is DotNetCurry.com");
    break;

    case "DevCurry":
    Console.WriteLine("This website is DevCurry.com");
    break;

    default:
    Console.WriteLine("Default Website");
}

As you can see, we start by defining a constant at the top:

Login failed for user IIS APPPOOL\AppPool4.5 or APPPOOL\ASP.NET

The error ‘Login failed for user 'IIS APPPOOL\AppPool4.5’ usually occurs when you configure a new website in IIS or move an existing website to a newer version of IIS.

A simple solution to the error is to add a login to SQL Server for IIS APPPOOL\ASP.NET v4.5 and grant appropriate permission to the database.

Open SQL Server Management Studio > Right click ‘Security’ > New > Login

iis-apppool-login

Getting Started with NUnit in ASP.NET MVC

Visual Studio 2012 comes with a perfectly capable Unit Testing system in MS Test. However if your team’s skills require you to use alternate Testing frameworks like NUnit, Visual Studio is game to play along. In this article, we’ll see the how we can setup NUnit to work with Visual Studio’s Test Explorer and run Unit tests in our project.

Setting up NUnit

There are two parts to NUnit setup for use in Visual Studio. First part is to install the framework, we can do this in two ways.

1. Download the 2.6.2 (latest at the time of writing) msi installer from http://www.nunit.org. Ensure Visual Studio is not running while the installer is running. This installs NUnit globally along with the NUnit test runner. However the test runner needs .NET 3.5 to run.

2. Another way to include NUnit in your project is to download it using the following Nuget Package Manager command

PM> install-package NUnit

Second part is to setup the NUnit Test Adapter so that Visual Studio recognizes the Test Cases in our project and allows us to Run them from the Test Explorer.

Debugging Parallel Code in Visual Studio

.NET 4.0 introduced the Task Parallel Library (TPL) and Parallel LINQ (PLINQ) in an attempt to make parallel programming simpler and making best use of multi-core processors easier.

Recently I was playing around with the Parallel.Foreach and the new Enumerator APIs for the File System in System.IO trying to build a Fast Folder Scanner when I chanced upon the Parallel debugging options in Visual Studio. After fiddling around a little bit, I was able to make sense of the information and it was kind of a ‘brain explode’ moment.

Let me share the things that I figured out.

The Harness Code

- Let’s create a Console Application called FastFolderScanner

- Next we put together the following code to scan folders for a particular type of file and split them out.

Using jQuery Mobile in ASP.NET MVC

This article is from our ASP.NET MVC 101 Tutorial Series

ASP.NET MVC 4 introduced a Mobile Site template that leverages the jQuery Mobile to serve up views tailored for consumption on Mobile devices. Even though the latest ASP.NET site templates have responsive CSS, the mobile views aren’t particularly suited for data intensive views. It would be better if we had views dedicated to handle smaller mobile screens and be mindful of touch based navigation.

You can either create a brand new site specifically targeted for Mobile (if you are starting a green-field project) or you can add Mobile views to an existing MVC project with advanced features like view switching between Mobile and Desktop views.

Today, we are going to look at building a Mobile site ground up, so we’ll start with the mobile site template in Visual Studio

Using AngularJS Modules and Services Feature in an ASP.NET MVC application

In our previous post, Hello AngularJS – Building a Tweet Reader we saw how to create a simple ASP.NET MVC application using AngularJS. We saw how the $scope and $http objects were injected in our app by Angular. We also saw how to do Templating and DataBinding. Today we will learn a few more constructs like the Modules and Services.

As with our demos we’ll walk with a code sample to see how the AngularJS features are used.

The Sample AngularJS Application - Recap

We’ll continue where we left off with the previous ASP.NET MVC sample where we built a Twitter reader.

The ASP.NET MVC Controller

To quickly recap, we have an ASP.NET MVC application with an MVC Controller. The controller has the Index action method. Here the LinqToTwitter framework first checks if user is Authenticated, if not, it redirects to Twitter and gets user to Authenticate.

Reading a Local File using HTML5 and JavaScript

One area where the web has lacked for some time is the lack of a true file system.  HTML5 fills this void by providing a standard way of interacting with local files using the FIle API specification.

These APIs are used to read file locally, handling images etc. Some of the specifications are as listed below:

1. File: Provides read-only information about the file like name, filesize, mimetype etc.

2. FileList: Represents an array of individually selected files from the local system

3. Blob: Represents the raw binary data and allows access to range of bytes within the data which can be used for slicing file

4. FileReader: Provides methods to read data from file or Blob

Task based WCF Services in .NET 4.5

Task based asynchronous programming is now simplified and streamlined in .NET 4.5 through the use of keywords ‘await’ and ‘async’. These keywords help makes asynchronous code look similar to synchronous coding, making it easier to write and understand Asynchronous code. Those who have used WCF service might have used the Asynchronous contract generation while adding WCF service reference in the Client application. The Asynchronous contracts are required so that client can make an Asynchronous call to WCF service performing time consuming operations.

In Visual Studio 2012 and WCF 4.5, there is a new option available to generate Task based operations so that the code from the client side can be then less complex. In the following example we will see how to implement it.

Sample Application

Step 1: Open VS2012 and create a blank solution, name it as ‘WCF_Task_Based_WCFService’. In this solution add a new WCF Service Application project targeting .NET 4.5 Framework. Name this project as ‘WCF_TaskBasedService’. Rename IService1.cs to IService.cs and Service1.svc to Service.svc.