Errors compiling C# programs from command line

Hello All I am a beginner in C#. I have installed the 106 MB Microsoft.NET SDK. I tested by compiling and executing "HelloWorld.cs" from the command prompt(I do not have VS.NET). It all went smoothly. Now I tried to compile and run a cs program that should simply show me a window. But I am getting the error: *********************************************************************** The type or namespace "Winforms" does not exist in the class or namespace "System". *********************************************************************** The error code is CS0234. I read somewhere that the the references to the DLLs should be added in the project page. But since I do not use VS.NET I cannot do this. Is there any way to sort this problem out? Please help!! ALL suggestions are welcome. BUT I can do this only using Notepad and Command prompt. Regards Satish Kumar