RT，新手求教！！！谢谢！！！！！

datarelation



DataColumn[] parentCols = new DataColumn[]
{DataSet1.Tables["Customers"].Columns["CustID"],
DataSet1.Tables["Customers"].Columns["OrdID"]};
DataColumn[] childCols= new DataColumn[]
{DataSet1.Tables["Orders"].Columns["CustID"],
DataSet1.Tables["Orders"].Columns["OrdID"]};

// Create DataRelation.
DataRelation CustOrderRel = new DataRelation(
"CustomersOrders", parentCols, childCols);

// Add the relation to the DataSet.
DataSet1.Relations.Add(CustOrderRel);