Links
To run applications developed in C# you must make sure that you have the .NET Frameworks properly installed.

If you don“t have it, download it now from Microsoft:
Microsoft .NET Framework Version 2.0 Redistributable Package (x86)
Microsoft .NET Framework Version 3.0 Redistributable Package (x86)

For those of you who are interested in C# development, a good place to start would be any of these links.

The Code Project
Experts Exchange
C-Sharp Corner