Biztalk 2006: How to use Biztalk message in C# code

Problem

How to use a Biztalk message in C# code

Solution

1. Add reference to Microsoft.XLANGs.BaseTypes.dll which is inside Biztalk installation directory
2. Add using Microsoft.XLANGs.BaseTypes; to your class
3. Declare variable like this: XLANGMessage BiztalkMessage