VB.NET Language in a Nutshell, Second Edition

Name

Throw Statement

Syntax

Throw exception

exception (required; an Exception object or an object derived from Exception)

An Exception object representing the exception being thrown

Description

Throws an exception that can be handled using either structured exception handling (a Try . . . Catch block) or unstructured exception handling (the On Error statement)

Example

Try
    ' Ask for a positive number
    Dim DataCt As Integer = CInt(InputBox("Enter number of items."))
    ' Check for error
    If DataCt <= 0 Then
        ' Throw an exception
        Throw New Exception("Must enter a positive number.")
    End If
Catch ex As Exception
    MsgBox(ex.Message)
End Try

VB.NET/VB 6 Differences

The Throw statement is new to VB.NET.

See Also

Exception Class, Try...Catch...Finally Statement