VB.NET On Error GoTo

|BLBS^ |On Error GoTo|BLBE^ | statements is an example of Vb.Net's |BLBS^ |Unstructured Exception Handling|BLBE^ | . VB.NET has two types of Exception handling . |BLBS^ |Structured Error Handling|BLBE^ | and |BLBS^ |Unstructured Error handling|BLBE^ | . VB.NET using Try..Catch statement for Structured Error handling and On Error GoTo statement is using for Unstructured Error handling.

Error GoTo redirect the flow of the program in a given location.

On Error Resume Next - whenever an error occurred in runtime , skip the statement and continue execution on following statements.

Take a look at the following program

VB.NET Source Code
Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button1.Click Dim result As Integer Dim num As Integer num = 100 result = num / 0 MsgBox("here") End Sub End Class
when u execute this program you will get error message like Arithmetic operation resulted in an overflow . See the program we put an On Error GoTo statement.




Public Class Form1
    Private Sub Button1_Click(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) Handles Button1.Click
        On Error GoTo nextstep
        Dim result As Integer
        Dim num As Integer
        num = 100
        result = num / 0
nextstep:
        MsgBox("Control Here")
    End Sub
End Class

When you execute the program you will get the message box "Control Here" . Because the On Error statement redirect the exception to the Label statement.