Question

I have the following VB.NET code:

Namespace Data 
    Public Module Part
        Public function IsValidPart() 
        End Function
    End Module
End NameSpace

Now, how do I call the IsValidPart method in the Part module? When I try to call the method, I get the following error:

The type initializer for ‘MyCompany.Lender.Data.Part’ threw an
exception. —> System.NullReferenceException: Object reference not
set to an instance of an object..

Answer 1

The problem code is not in your snippet. It is caused by an initialization of a variable in your module. A simple example of such a problem is:

Module Module1
    Public Example As String = Nothing.ToString()

    Sub Main()
    End Sub
End Module

You get a non-descript TypeInitializationException when the static constructor for the module runs. Which is code that the compiler generates to ensure the Example variable gets initialized. Unfortunately, the debugger doesn’t display a good diagnostic for this.

You can find the problem statement with Debug + Exceptions, tick the Thrown box for CLR exceptions.