Programming Tutorials

Getting an Exception's Number and Description in VB.net

By: Steven Holzner  

For more information on exceptions, you can use the Err object's Number and Description properties, like this:

Module Module1
    Sub Main()
        Dim int1 = 0, int2 = 1, int3 As Integer
        On Error Goto Handler
        int3 = int2 / int1
        System.Console.WriteLine("Program completed...")
Handler:
        System.Console.WriteLine("Error number {0} occurred: {1}", _
            Err.Number, Err.Description)
    End Sub
End Module

Here's what you see when you run this console application:

Error number 6 occurred: Exception of type System.OverflowException was
thrown.
Tip 

You can determine the object that caused the exception using the Visual Basic Err object's Source property. This property holds the name of the object or application that caused the exception. For example, if you connect to Microsoft Excel and it generates an exception, Excel sets Err.Number to its error code for that exception, and it sets Err.Source to "Excel.Application".



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