DataView in asp.net

DepartmentsSectionsParameterBuilder pm1 = new DepartmentsSectionsParameterBuilder();
pm1.AppendEquals(DepartmentsColumn.AssetId, assetId.ToString());     

TList<DepartmentsSections> objDeptList = DataRepository.DepartmentsSectionsProvider.Find(pm1.GetParameters());

DataSet dsNode = new DataSet();
if (dsNode != null && dsNode.Tables[0].Count > 0 )

{
      dsNode = objDeptList.ToDataSet(true); //--Convert from List to dataset
      DataView dv = dsNode.Tables["Departments"].DefaultView;

dv.RowFilter = "SectionName='Section1'";
}