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This example requires that a Text Box and Error Provider control have been created on a form.Let’s assume when we click our save button that we wish to validate the controls and display an icon if there is a problem.Figure 1 - These objects will determine if all our data is valid or not. Clear() 'Clear Text Box Name Valid = False 'Boolean = False Else Name Valid = True 'Everything Fine End If End Sub Easy one to start with. Focus() 'Set Focus To Text Box End If End Sub Private Sub txt Email_Lost Focus(sender As Object, e As System. Lost Focus Validate Email() 'Check Email Validity End Sub The expression may look horrible to the layman's eye, but look closer. To check if the user has entered an email that actually exists, you will have to find a different way such as to send a of some sorts.
First add the following imports before your Public Class Form1 Private Sub Button1_Click(sender As System. NETDisplay Access Table Records in Data Grid View - Visual Basic . NETVisual Basic Tutorials Simple Login Tutorial - Visual Basic .Which you set to False on, say, the Cancel button of a dialog.