Question

I put a try/catch block around a bit of code that occasionaly throws an expected exception, but rather than catching it and displaying the message box, it stops the debugger and alerts me that the exception is unhandled.

How do I handle this exception so my code doesn’t stop when the exception occurs?

Friend myDevInfo As New devInfo

        ''' <summary>
        ''' Closes the device handle obtained with CreateFile and frees resources.
        ''' </summary>
        ''' 
        Friend Sub CloseDeviceHandle()

            Try
                WinUsb_Free(myDevInfo.winUsbHandle)

                If Not (myDevInfo.deviceHandle Is Nothing) Then
                    If Not (myDevInfo.deviceHandle.IsInvalid) Then
                        myDevInfo.deviceHandle.Close()
                    End If
                End If

            Catch ex As System.AccessViolationException
                MsgBox("System.AccessViolationException")
            Catch ex As Exception
                Throw
            End Try

        End Sub

Answer 1

The try...catch block should work as expected, when no debugger is attached.
You can define what exceptions the debugger breaks on under Debug -> Exceptions, I believe the default is to break on AccessViolationException.