Question

Could anyone please give me a short working example of a C# class which can be compiled to a DLL, and an example of VB.NET-code creating an object based on this class and using its members (methods). The C# class has to have a namespace, at least one class definition (obviously) and some methods or whatever they ought to be called. I have someone else’s code of a C#-DLL but cannot see its members in my VB-project. I know I have to make a reference to the DLL in my VB.NET project. I’m using VB.NET Express 2008 and C# 2008 Express.

Answer 1

–foo.cs

namespace Sharp
{
    public class Foo
    {
        public string Message
        {
            get { return "This is from CSharp"; }
        }
    }
}

–bar.vb

Namespace bartest
   Public Class Bar

     Public Shared Sub Main()
        Dim test as Sharp.Foo
        test = New Sharp.Foo()
        Console.WriteLine(test.Message)

     End Sub

  End Class
End Namespace

–batch file to compile

%WINDIR%\Microsoft.NET\Framework\v3.5\csc.exe /target:library foo.cs 
%WINDIR%\Microsoft.NET\Framework\v3.5\vbc.exe bar.vb /reference:foo.dll

–run bar.exe