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Posted by / 28-Jun-2017 10:26

Vb code for validating textbox

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Match(emailaddress, pattern) If email Address Match. Success Then emailaddresscheck = True Else emailaddresscheck = False End If End Function Private Sub Text Box1_Text Changed(By Val sender As Object, By Val e As System.

Text 'Dim conditon As Boolean = False If emailaddresscheck(temp) = True Then ': If emailaddresscheck(conditon) = True Then Text Box1. Success Then Email Address Check = True Else Email Address Check = False End If End Function Private Sub Button5_Click(By Val sender As System.

Run(form1) End Sub End Class Public Class Form1 Inherits System. Protected Overloads Overrides Sub Dispose(By Val disposing As Boolean) If disposing Then If Not (components Is Nothing) Then components. Dispose(disposing) End Sub 'Required by the Windows Form Designer Private components As System. IContainer 'NOTE: The following procedure is required by the Windows Form Designer 'It can be modified using the Windows Form Designer.

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. New() 'This call is required by the Windows Form Designer. Text Box Friend With Events txt Last Name As System. however even when a valid email is entered is still says invalid email entry Private Sub Email Text Box_Validating(By Val sender As System. Show("Please enter your email address correctly", "Incorrect Email Entry") Email Text Box. Green End If End Sub Private Function emailaddresscheck(By Val emailaddress As String) As Boolean Dim pattern As String = "^[a-z A-Z][\w\.-]*[a-z A-Z0-9]@[a-z A-Z0-9][\w\.-]*[a-z A-Z0-9]\.[a-z A-Z][a-z A-Z\.]*[a-z A-Z]$" Dim email Address Match As Match = Regex.

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