DataColumn[] parentCols =
{OrderDt.Columns["MERCHANTID"],OrderDt.Columns["OTNO"]};

DataColumn[] childCols =
{OrderDetailDt.Columns["MERCHANTID"],OrderDetailDt.Columns["OTNO"]};  OrderDt.TableName = “MPRORDER”;OrderDetailDt.TableName = “MPRORDERDETAIL”;
 

ds.Tables.Add(OrderDt);

ds.Tables.Add(OrderDetailDt);

DataRelation dtr = new DataRelation(“OrderOrderdetail”, parentCols, childCols);
 

ds.Relations.Add(dtr);

public staic void main()

{

       System.out.write(“Hello world!”);

}