private void btnsave_Click(object sender, EventArgs e)
 {
     if (this.cbo_bank.Text == string.Empty || this.cbo_branch_name.Text == string.Empty || this.txt_account_number.Text == string.Empty || this.txt_nssf_number.Text == string.Empty || this.txt_guard_number.Text == string.Empty)
     {
         MessageBox.Show("Fields with (*) are required", "save", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
         return;
     }
     Salary_scales.insert_update_guard_account_details("insert_update_guard_account_details", this.txt_guard_number.Text, Convert.ToInt32(this.cbo_bank.SelectedValue.ToString()), Convert.ToInt32(this.cbo_branch_name.SelectedValue.ToString()), this.txt_account_number.Text, this.txt_nssf_number.Text, txtTin.Text, txtAutoID.Text);
     MessageBox.Show("Success", "save", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
     this.get_guard_bank_mapping();
 }