private void btnAdd_Click(object sender, EventArgs e)
 {
     frmIns_Allowance afrmIns_Allowance = new frmIns_Allowance(this);
     afrmIns_Allowance.ShowDialog();
 }
 private void btnInsAllowances_ItemClick(object sender, ItemClickEventArgs e)
 {
     try
     {
         frmIns_Allowance afrmIns_Allowance = new frmIns_Allowance();
         afrmIns_Allowance.Show();
     }
     catch (Exception ex)
     {
         MessageBox.Show("frmMain.btnInsAllowances_ItemClick\n" + ex.ToString(), "Lỗi", MessageBoxButtons.OK, MessageBoxIcon.Error);
     }
 }