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
