Original VB6 code:

Public Sub method1()
    MsgBox “Hello world”
End Sub

The Visual Basic Upgrade Companion generated source code will include some attributes to expose the resulting assemblies through a COM interface.

VB.NET code generated by the Visual Basic Upgrade Companion:

 Option Strict Off Option Explicit On
Imports System
Imports System.Runtime.InteropServices
Imports System.Windows.Forms
<ComVisible(True)>
<ProgId("Project1.Class1")> <ClassInterface(ClassInterfaceType.AutoDual)>
                                 
Public Class Class1
    Public Sub method1()
        MessageBox.Show("hello world", Application.ProductName)    
    End Sub    
End Class

C# code generated by the Visual Basic Upgrade Companion:

using System; 
using System.Runtime.InteropServices; 
using System.Windows.Forms; 
using VB6 = Microsoft.VisualBasic.Compatibility.VB6.Support; 
                                  

namespace Project1{

                                   
Generated attributes for COM visibility 
                                    
[ComVisible(true)]
[ProgId("Project1.Class1")]
[ClassInterface(ClassInterfaceType.AutoDual)]
                                
public class Class1{ 
public void method1(){
		MessageBox.Show("hello world", Application.ProductName);
}}                           

 }                              

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