validation email in code behind

 If txtRespondentEmail.Text = String.Empty Or System.Text.RegularExpressions.Regex.IsMatch(txtRespondentEmail.Text, “\w+([-+.’]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*”) = False Then
                lblMessageEmail.Text = “*”
                nextButton.Enabled = False
            Else
                lblMessageEmail.Text = “”
            End If

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