Code:

//create an empty DataTable and Add some columns to it
Basket_DataTable = new DataTable();
Basket_DataTable.Columns.Add("ProductID");
Basket_DataTable.Columns.Add("ProductName");
Basket_DataTable.Columns.Add("CatalogNumber");
Basket_DataTable.Columns.Add("Quantity");
Basket_DataTable.Columns.Add("PackageSize");
Basket_DataTable.Columns.Add("Price");
Basket_DataTable.Columns.Add("Total");
Basket_DataTable.Columns.Add("PackageSizeID");

// Now throw the new datatable in the session.
Session["Basket"] = Basket_DataTable;