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(); }