datatable建立一個主/從關係

private void GetData(){    try    {        // Specify a connection string. Replace the given value with a         // valid connection string for a Northwind SQL Server sample        // database accessible to your system.        String connectionString =            "Integrated Security=SSPI;Persist Security Info=False;" +            "Initial Catalog=Northwind;Data Source=localhost";        SqlConnection connection = new SqlConnection(connectionString);        // Create a DataSet.        DataSet data = new DataSet();        data.Locale = System.Globalization.CultureInfo.InvariantCulture;        // Add data from the Customers table to the DataSet.        SqlDataAdapter masterDataAdapter = new            SqlDataAdapter("select * from Customers", connection);        masterDataAdapter.Fill(data, "Customers");        // Add data from the Orders table to the DataSet.        SqlDataAdapter detailsDataAdapter = new            SqlDataAdapter("select * from Orders", connection);        detailsDataAdapter.Fill(data, "Orders");        // Establish a relationship between the two tables.        DataRelation relation = new DataRelation("CustomersOrders",            data.Tables["Customers"].Columns["CustomerID"],            data.Tables["Orders"].Columns["CustomerID"]);        data.Relations.Add(relation);        // Bind the master data connector to the Customers table.        masterBindingSource.DataSource = data;        masterBindingSource.DataMember = "Customers";        // Bind the details data connector to the master data connector,        // using the DataRelation name to filter the information in the         // details table based on the current row in the master table.         detailsBindingSource.DataSource = masterBindingSource;        detailsBindingSource.DataMember = "CustomersOrders";    }    catch (SqlException)    {        MessageBox.Show("To run this example, replace the value of the " +            "connectionString variable with a connection string that is " +            "valid for your system.");    }}