private void LoadDataToDepartment()
{
if (trDepartment.Nodes.Count > 0)
trDepartment.Nodes.Clear();
cls_DepartmentInformation objDe = new cls_DepartmentInformation();
dtDepartment = objDe.GetList();
ShowDSTreeview(trDepartment, dtDepartment, 0, "Id", "Name", "Belong_DepartmentId","Toàn bộ phòng ban");
trDepartment.ExpandAllNodes();
}