private void tbCod_method_Validating(object sender, CancelEventArgs e)
{
try
{
List<CTemplate_method> lstTemplateMethod = new Methods().GetAllLastVersionMethods();
if (lstTemplateMethod.Exists(c => c.Cod_template_method == tbCod_method.Text.Trim()))
e.Cancel = true;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}