Add a startup.cs class to your application

Startup page is mostly using to configuration for startup of the application when you are configuration OWIN or the OAuth authorization.

There are two what you can directly add it and  as a class file and decorate it as. OWinStartup:

[assembly: OwinStartup(typeof(WebApiOAuth_1.App_Start.Startup))]

Or you can create startup.cs through the Visual Video by using the below process.

a.       Rt click on App_Start à Add à Class

Issue : procedure entry point __crtCreateSymbolicLinkW could not be located in the dynamic link library MSVCR110.dll.

Issue :

if you are getting below issue while starting the visual studio 2012,

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devenv.exe - Entry Point Not Found
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The procedure entry point __crtCreateSymbolicLinkW could not be located in the dynamic link library MSVCR110.dll.
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OK
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Solution

Just install Visual C++ Redistributable for Visual Studio 2012 Update 4 from below link,
Based on requirement download 32bit or 64bit setup.

https://www.microsoft.com/en-in/download/details.aspx?id=30679

VS2015 New Features

1.       Download Visual studio community version as free.

Use below link to get the download page. Microsoft announce for open source of community version of VS2015.

https://www.visualstudio.com/en-us/downloads/download-visual-studio-vs.aspx