Hou to dll in Visual Studio without using console?

[C# Programming]

I did the following example from msdn

C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc /target:library /out:MathLibrary.DLL Add.cs Mult.cs

csc /out:TestCode.exe /reference:MathLibrary.DLL TestCode.cs

http://msdn.microsoft.com/en-us/library/3707x96z%28v=vs.80%29.aspx

but how do I do the same thing in GUI of VS? Like having 2 files building a dll and then an exe linked to it?

Thanks.