private void AdminCorrelativos_Load(object sender, EventArgs e)
        {
            // mostrar valores actuales
            try
            {
                var exp = new e_expedientes();

                textCorrelativoExp.Text    = exp.GetCorrelativoExp().ToString();
                textCorrelativoIIOO.Text   = exp.GetCorrelativoIIOO().ToString();
                textCorrelativoRedTIC.Text = exp.GetCorrelativoRedTIC().ToString();
            }
            catch (Exception ex)
            {
                Log.ShowAndLog(ex);
            }
        }