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