System.Data.Tests.DataTableTest3.MakeDataRelation C# (CSharp) Метод

        private void MakeDataRelation()
        {
            DataColumn parentColumn = _dataSet.Tables["ParentTable"].Columns["id"];
            DataColumn childColumn = _dataSet.Tables["ChildTable"].Columns["ParentID"];
            DataRelation relation = new DataRelation("ParentChild_Relation1", parentColumn, childColumn);
            _dataSet.Tables["ChildTable"].ParentRelations.Add(relation);

            DataColumn[] parentColumn1 = new DataColumn[2];
            DataColumn[] childColumn1 = new DataColumn[2];

            parentColumn1[0] = _dataSet.Tables["ParentTable"].Columns["id"];
            parentColumn1[1] = _dataSet.Tables["ParentTable"].Columns["DepartmentID"];

            childColumn1[0] = _dataSet.Tables["SecondChildTable"].Columns["ParentID"];
            childColumn1[1] = _dataSet.Tables["SecondChildTable"].Columns["DepartmentID"];

            DataRelation secondRelation = new DataRelation("ParentChild_Relation2", parentColumn1, childColumn1);
            _dataSet.Tables["SecondChildTable"].ParentRelations.Add(secondRelation);
        }