I am trying to compile a tile map editor so I can use it to work on a game, but I am getting the error "The type or namespace name 'Compression' does not exist in the namespace 'System.IO'" when I try to build in Visual C#. Does anyone know how I can fix this? I tried google but I found nothing.
You probably don't have a reference to
System.dll, or you're using a version of .NET before version 2.0.