Use VB Component in C#

Imports System
Namespace hellovb
Public Class HelloString
Public Function GetString() As String

Console.WriteLine ("Hello World in Visual Basic Program")

End Function
End Class
End Namespace

' Compile it using vbc /t:library hellovb.vb
' This command will generate hellovb.dll
' Hello World program in C# (hellocs.cs)

using System;
namespace hellocs{
public class displayA

{

public void Displayhello()
{
Console.WriteLine("Hello in C# Program");
}
}
}

' Compile it using csc /t:library hellocs.cs
' This command will generate hellocs.dll
' Main program(in c#) in which we will use these libraries

Main Program in C# (maincs.cs)
using System;
using hellocs;
using hellovb;
class maincs

{
public static void Main()
{

hellovb.HelloString vb = new hellovb.HelloString(); // namespace.classname of hellovb.vb
vb.GetString(); //Calling vb function
hellocs.displayA cs = new hellocs.displayA(); // namespace.classname of hellocs.cs
cs.Displayhello(); //Calling vb function
}
}

' Compile it using command csc maincs.cs /r:hellocs.dll;hellovb.dll
' Output will be
' Hello World in Visual Basic Program
' Hello in C# Program