private void btnInsRoom_ItemClick(object sender, ItemClickEventArgs e)
 {
     try
     {
         frmIns_Rooms afrmIns_Rooms = new frmIns_Rooms(this);
         afrmIns_Rooms.Show();
     }
     catch (Exception ex)
     {
         MessageBox.Show("frmMain.btnInsRoom_ItemClick\n" + ex.ToString(), "Lỗi", MessageBoxButtons.OK, MessageBoxIcon.Error);
     }
 }
 //=======================================================
 //Author: LinhTN
 //Function : Add Rooms
 //=======================================================
 private void btnAddRoom_Click(object sender, EventArgs e)
 {
     frmIns_Rooms afrmAddRooms = new frmIns_Rooms(this);
     afrmAddRooms.ShowDialog();
 }