Why locating DataSetTable Adapter into App_Code classes causes ObjectDataSources fail

[Eyadtrabulsi]

I added this method to DataAccess.cs Class to have the ability to delete rows from my DataTable by using ObjectDataSourc e & DataGrid:

public void DeleteItems()
{
DataSet1TableAd apters.ProTable TableAdapter ProductsAdapter = new DataSet1TableAd apters.ProTable TableAdapter();
DataSet1.ProTab leRow product = new DataSet1.ProTab leRow();

ProductsAdapter .DeleteQuery(pr oduct.ProductID );
}

but the result was weired when configuring data source, All the business objects have disappeared

And how could I add DeleteQuery filters by ProductID to be related to DataGrid's Delete column..??
I followed the same instructions on this page but it was in vein

http://msdn.microsoft.com/vstudio/tour/vs2005_guided_tour/WebDev/WebDev/webdev12.htm

[Eyadtrabulsi]

does the arranging of creating objects & classes affect linking or interacting between them..?