CafeProject.frmKategori.btn_sil_Click C# (CSharp) Метод

        private void btn_sil_Click(object sender, EventArgs e)
        {
            if (cmb_sil.SelectedItem == null)
            {
                MessageBox.Show("Lütfen Seçim Yapınız!");
            }
            else
            {
                SqlCommand cm = new SqlCommand("kat_sil", db.dbConnect());
                cm.CommandType = CommandType.StoredProcedure;
                cm.Parameters.Add("@id", SqlDbType.Int).Value = katId[cmb_sil.SelectedIndex];
                db.dbConnect();
                cm.ExecuteNonQuery();
                db.dbClose();
                cmbDoldur();
                katDoldur();
                cmb_sil.Text = "";
            }
        }