Creating a dataset structure manually

protected DataSet CreatePurchaseRequestStructure()
{
DataSet dsPurchaseRequestItem = new DataSet();
DataTable dt = new DataTable();
dsPurchaseRequestItem.Tables.Add(dt);
DataColumn dcItemId = new DataColumn("ItemId");
DataColumn dcItem = new DataColumn("Item");
DataColumn dcSupplierId = new DataColumn("SupplierId");
DataColumn dcSupplier = new DataColumn("Supplier");
DataColumn dcUnitId = new DataColumn("UnitId");
DataColumn dcUnit = new DataColumn("Unit");
DataColumn dcRequestedQuantity = new DataColumn("RequestedQuantity");
DataColumn dcCurrentStock = new DataColumn("CurrentStock");
DataColumn dcMinimumReorderQuantity = new DataColumn("MinimumReorderQuantity");
DataColumn dcPendingQuantity = new DataColumn("PendingQuantity");

dsPurchaseRequestItem.Tables[0].Columns.Add(dcItemId);
dsPurchaseRequestItem.Tables[0].Columns.Add(dcItem);
dsPurchaseRequestItem.Tables[0].Columns.Add(dcSupplierId);
dsPurchaseRequestItem.Tables[0].Columns.Add(dcSupplier);
dsPurchaseRequestItem.Tables[0].Columns.Add(dcUnitId);
dsPurchaseRequestItem.Tables[0].Columns.Add(dcUnit);
dsPurchaseRequestItem.Tables[0].Columns.Add(dcRequestedQuantity);
dsPurchaseRequestItem.Tables[0].Columns.Add(dcCurrentStock);
dsPurchaseRequestItem.Tables[0].Columns.Add(dcMinimumReorderQuantity);
dsPurchaseRequestItem.Tables[0].Columns.Add(dcPendingQuantity);
return dsPurchaseRequestItem;
}