Question

DataSet customerOrders = new DataSet();
DataSet.CustomersDataTable customers = new DataSet.CustomersDataTable();
CustomersTableAdapter adapter = new CustomersTableAdapter();
adapter.Fill(customers);

DataSet.OrdersDataTable orders = new DataSet.OrdersDataTable();
OrdersTableAdapter oAdapter = new OrdersTableAdapter();
oAdapter.Fill(orders);

DataRelation relation = (DataRelation)customerOrders.Relations[0];


foreach (DataRow row in customers.Rows)
{
    foreach (DataRow orderRow in row.GetChildRows(relation))
    {
        Response.Write(orderRow["OrderID"].ToString());
    }
}

I get this exception : The row doesn’t belong to the same DataSet as this relation.

What am I doing wrong?

Answer 1

Your customers DataTable doesn’t belong to customerOrders DataSet.

You must change this fragment of code

DataSet.CustomersDataTable customers = new DataSet.CustomersDataTable();

by this

DataSet.CustomersDataTable customers = customerOrders.Tables.Add("Customers");