A question about DateSet

accers

/ * On the other hand, the DataSet class was originally designed to establish relationships between data tables.
* The code in this section shows how to manually generate and populate two data tables. If you do not have SQL Server or North Wind database
* You can run this example
* /
DataSet ds = new DataSet ("Relationships");
ds.Tables.Add (CreateBuildingTable ());
ds.Tables.Add (CreateRoomTable ());
ds.Relations.Add ("Rooms", ds.Tables ["Building"]. Columns ["BuildingID"], ds.Tables ["Room"]. Columns ["BuildingID"]);
Error 1 The name "CreateBuildingTable" does not exist in the current context
Error 2 The name "CreateRoomTable" does not exist in the current context

Doesn't this example say to manually generate 2 DataTables in a DataSet
What went wrong? Thank you for your kind suggestion

yanan13115

"CreateBuildingTable"
"CreateRoomTable"
These are the two functions that create a table. If you don't define it, you will of course make mistakes!
You can define it as follows:
private System.Data.DataTable CreateBuildingTable ()
{
    System.Data.DataTable dtRet = new System.Data.DataTable ("Building");
    dtRet.Columns.Add (new System.Data.DataColumn ("BuildingID", System.Type.GetType ("System.Int32"));
    // and so on, add the remaining columns
    return dtRet;
}

private System.Data.DataTable CreateRoomTable ()
{
    System.Data.DataTable dtRet = new System.Data.DataTable ("Building");
    dtRet.Columns.Add (new System.Data.DataColumn ("BuildingID", System.Type.GetType ("System.Int32"));
    // and so on, add the remaining columns
    return dtRet;
}

psycholmu

CreateBuildingTable ()
CreateRoomTable ()
Are two methods

yanan13115

Change Building in the second to Room!