query = "DELETE FROM Customer WHERE Account_No=@Account_No";
SqlCommand cmd = new SqlCommand(query, cn);
cmd.Parameters.AddWithValue("@Account_No", txtaccount1.Text + "-" + txtaccount2.Text);
cn.Open();
cmd.ExecuteNonQuery();
cn.Close();
MessageBox.Show("Record Deleted Successfully", "Success Message", MessageBoxButtons.OK, MessageBoxIcon.Information);