Is it possible to build .NET programs without Visual Studio?

C#, Visual Basic, and JScript .NET command-line compilers are part of the .NET Framework 2.0 Software Development Kit (SDK), which is freely available at
http://msdn.microsoft.com/en-us/netframework/aa731542.aspx

Later versions of the .NET Framework include these command-line compilers in the distribution of the Framework, itself. Usually, a shortcut is put on the
Windows Start Menu for opening a command prompt with PATH and other environment variables set so that these tools are found when run. You could also search
your hard disk for the C# compiler, csc.exe, and then add its directory to your search path.