protected void ddlTipoArticulo_SelectedIndexChanged(object sender, EventArgs e) { if (!ddlTipoArticulo.SelectedItem.Value.Equals("0")) { ddlMarca.Items.Clear(); ddlMarca.Items.Add(new ListItem("", "0")); ddlMarca.Enabled = true; BLCatalogos blCatalogos = new BLCatalogos(); blCatalogos.CargaMarcaporTipoEquipo(ref ddlMarca, Convert.ToInt32(ddlTipoArticulo.SelectedItem.Value)); } else { ddlMarca.SelectedIndex = 0; ddlMarca.Enabled = false; } }