private void buttonCooksWithShoppings_Click(object sender, EventArgs e) { int ID; try { ID = int.Parse(textBoxSpecifyCookIDForShoppings.Text); if (ID < 1) { textBoxSpecifyCookIDForShoppings.Text = "1"; ID = 1; } } catch { ID = 1; textBoxSpecifyCookIDForShoppings.Text = "1"; } Cook.GetCooksWithShoppings(sqlConnection, sqlDataAdapter, checkBoxFillingRightTable.Checked ? dataGridViewSecondTable : dataGridViewFirstTable, ID); }