private void MtxtEmail_Validating(object sender, CancelEventArgs e)
{
if (!RegularExpression.EmailValidation(MtxtEmail.Text.ToString()))
{
var message = MessageBox.Show("Please enter a valid Email Address", "Error", MessageBoxButtons.RetryCancel,
MessageBoxIcon.Error);
if (message == DialogResult.Retry)
{
MtxtEmail.SelectAll();
e.Cancel = true;
}
}
}