private void btOk_Click(object sender, EventArgs e)
{
if (AreUserAndPwdRight())
{
this.DialogResult = DialogResult.OK;
ComunForm.Send_user();
}
else
{
tbPwd.Text = "";
tbUser.Focus();
laMessage.Text = "Nombre o contraseña no válidos";
this.DialogResult = DialogResult.None;
}
}