private void email_txb_Leave(object sender, EventArgs e)
{
if (string.IsNullOrEmpty(email_txb.Text) == true)
{
e4.SetError(this.email_txb, "Enter an email");
}
else if (Regex.IsMatch(email_txb.Text, patt) == false)
{
e4.SetError(this.email_txb, "Email is Not valid");
}
else if (rs.IsemailAva(email_txb.Text) == 1)
{
e4.SetError(this.email_txb, "Email is Allready registered");
}
else
{
e4.Clear();
}
}
