TableAdapter won't pull correct data for update method

I am working on an asp.net application that will allow my company to pick an item from a datagrid, and then print the list of items selected out with there corresponding locations within our warehouse. I took the approach of programming this like a shopping cart in that a clerk can search for an item and it's locations are displayed in one gridview, if they select a particular row, it's contents are added to another gridview. The problem I am having is that I can't seem to update this second gridview, which is the Editable GridView on Matt Dotson's MSDN blog. The update method I call works correctly but it doesn't recognize that I've changed the data in the Textbox.

Example is if the default quantity was 0 and I change it to 12 in the textbox, once I push the update button it updates with the quantity as 0 and not 12. I have verified this much by stepping through code within the debugger.

protected void GridViewPickList_RowUpdating(object sender, GridViewUpdateEventArgs e)
        {
            //Declare the TableAdapter so we can update our DataTable
            IntraDataTableAdapters.VP_Atlanta_WarehouseLocationsTableAdapter WarehouseAdapter = new global::Intranet.IntraDataTableAdapters.VP_Atlanta_WarehouseLocationsTableAdapter();
            IntraData._VP_Atlanta_WarehouseLocationsDataTable WarehouseDT = new IntraData._VP_Atlanta_WarehouseLocationsDataTable();
 
            //Pull our Existing DataTable from the SessioinState
            PickListDT = (DataTable)Session["PickList"];
 
            foreach (DataRow PickListRow in PickListDT.Rows)
            {
                //Validate Data and Controls
                //this.Validate();
                //This is a little hack to get our rows to have an Unchanged RowState
                PickListRow.AcceptChanges();
                PickListRow.SetModified();
 
                //Finally Update The database.
                try
                {
                    WarehouseAdapter.Update(PickListRow);
                }
                catch (Exception except)
                {
 
                    LabelMessageInfo.Text = except.ToString();
                }
 
                //PickListDT.AcceptChanges();
 
                //Session["PickList"] = PickListDT;
            }
 
            GridViewPickList.DataSource = PickListDT;
            GridViewPickList.DataBind();
 
            //WarehouseAdapter.FillWarehouseLocation(WarehouseDT);
            //LocationGridView.DataSource = WarehouseDT;
            //LocationGridView.DataBind();
            //UpdatePanelDataGrid.Update();
        }

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TableAdapter won't pull correct data for update method

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