When you develop a new VB.NET function to be used in GuiXT you can display test messages with the MsgBox() function:

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 Public Sub show_msgBox(ByVal text As String)

    MsgBox(text)

End Sub

For example, when you call this function in GuiXT with

For the development of complex VB.NET functions the Visual Studio debugger is very useful. It contains various functions such as stepwise processing and displaying or changing of variables.

To start the debugger you can use the VB.NET function "Stop":

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Public Sub debugMe()

   Stop

End Sub

The following screen depends on the Visual Studio version or versions that you have installed; here we see Visual Studio 2008:

 

Confirm the debugger activation in order to obtain the Visual Studio debug window:

Please note: In order to test a new version of your dll, SAP GUI needs to be closed.  Stop the debugger and then close the SAP GUI process, e.g. using Windows Task manager:

An additional remark: Instead of putting a "Stop" command into your VB coding you can start the debugger for a running SAP GUI session in Windows task manager with the "Debug" menu item (see screenshot above). When the debugger has started you can work with dynamic breakpoints.