How to find out what version of the common language runtime I am using on my machine in C#?

286.

Response.Write(System.Environment.Version.ToString() );

Response.Write(System.Environment.Version.Version.ToString() );

Response.Write(System.Environment.ToString() );

Response.Write(System.Version.ToString() );

Gets a Version object that describes the major, minor, build, and revision numbers of the common language runtime.