How to Validate Email Address in Textbox (VB.Net)

The small application below show you how to validate email address in textbox using VB.Net. To test process, I have designed as below:

No	Control Type	Name	Text
1	Form1	ValidateEmail	Validate Email
2	Textbox1	TextBoxEmail
3	Label1	LabelStatus
4	Button1	ButtonValidate	Validate Email

This process, I used ButtonValidate_Click to check email address in TextBoxEmail. I use to condition which is True/False condition as you see in code below and the result will show in LabelStatus. This code work propertly!!!

Code

Imports System.Text.RegularExpressions

Public Class ValidateEmail

    Private Sub ButtonValidate_Click(sender As Object, e As EventArgs) Handles ButtonValidate.Click

        Dim pattern As String = "^[a-z][a-z|0-9|]*([_][a-z|0-9]+)*([.][a-z|0-9]+([_][a-z|0-9]+)*)?@[a-z][a-z|0-9|]*\.([a-z][a-z|0-9]*(\.[a-z][a-z|0-9]*)?)$"

        Dim match As System.Text.RegularExpressions.Match = Regex.Match(TextBoxEmail.Text.Trim(), pattern, RegexOptions.IgnoreCase)

        If (match.Success) Then

            LabelStatus.Text = "The email address :  " & TextBoxEmail.Text & "  is corrected"

        Else

            LabelStatus.Text = "The email address :  " & TextBoxEmail.Text & "  is incorrected !!!"

            TextBoxEmail.Clear()

        End If

    End Sub

End Class

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