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