VB6 Legacy and COM Interop

Patterns for maintaining VB6 code and strategies for migrating to VB.NET with COM interop.

VB6 to VB.NET Migration

Key Differences

' VB6 - Variant types
Dim data As Variant
data = 123
data = "Hello"

' VB.NET - Strong typing with Option Strict On
Option Strict On
Dim data As Object  ' Still avoid when possible
Dim number As Integer = 123
Dim text As String = "Hello"