If the e-mail address is not in the standard format (containing "@" and "."), the validation fails, an Error Provider icon is displayed, and the event is canceled.

This example requires that a Text Box and Error Provider control have been created on a form.

Hi Everyone, In my form there is a "Validating" event on a textbox. Is there a way to not execute the "Validating" event when the user clicks on the "Cancel" button? End Sub Private Sub Button1_Mouse Leave(By Val sender As Object, By Val e As System. Mouse Leave b Validate Text Box = True '// Enable Validation. End Sub Private Sub Text Box1_Validating(By Val sender As Object, By Val e As System.

If the e-mail address is not in the standard format (containing "@" and "."), the validation fails, an Error Provider icon is displayed, and the event is canceled. Index Of("@")) Then error Message = "" Return True End If End If error Message = "E-mail address must be valid e-mail address format." Control Chars. Validating Dim error Msg As String If Not Valid Email Address(text Box1. To view a Visual Basic, C#, or C example, click the Language Filter button in the upper-left corner of the page.

This example assumes that a Text Box and Error Provider control have been created on a form. Length = 0 Then error Message = "E-mail address is required." Return False End If ' Confirm that there is an "@" and a "." in the e-mail address, and in the correct order. Cr _ "For example '[email protected]' " Return False End Function Private Sub text Box1_Validating(By Val sender As Object, _ By Val e As System. Text, error Msg) Then ' Cancel the event and select the text to be corrected by the user. Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family Control Class | Control Members | System.

For more information, see the WM_KILLFOCUStopic, and the "Message Deadlocks" section of the About Messages and Message Queues topic.

The following code example uses the derived class Text Box and validates an e-mail address that the user enters.

VB6 namespace are provided for use by the tools for upgrading from Visual Basic 6.0 to Visual Basic.

In JScript, you can handle the events defined by a class, but you cannot define your own.

Let's give it a try, and add a Required Field Validator to our page.

We will also add a Text Box to validate, as well as a button to submit the form with.

You should always use the Validating event, it was made to support validation.

If not to prevent the focus change then at least for the Causes Validation property.

The event handler receives an argument of type Event Args.