I think you're missing setting the View or ViewID property (can't remember the name) to "AR0024"

Don't use C# for Sage forms, use VBDotNet.

I figured out my issue. Instead of dropping a DataSource control on my Form from the Toolbox(Which I was used to doing in VB6) I just used code to create my DataSource.

Is there a reason why?

I've created a few applications that use the Advantage API in C#. This will be my first that uses the COMAPI in C#.

I've never seen any issues using C# over VB(.net) for either the .NET API or the COM API. Sure there are language differences, and you have to play around to get things working but in general stuff works fine.