Problem Updating Multiple Rows within a GridView

I am trying to upgrade multiple fields within a gridview  but can't seem to see what I am missing in my in my code behind.  The code on my button click is as follows:

I am trying to meet a deadline tonight and have been working on this one quirk for the last 6 hours.  Any help would be greatly appreciated.
protected void ButtonPickOrder_Click(object sender, EventArgs e)
        VpaimsTableAdapters.Warehouse_LocationsTableAdapter WarehouseAdapter = new VpaimsTableAdapters.Warehouse_LocationsTableAdapter();
        string _number;
        int _pallets;
        int _cases = 0;
        int _julien;
        int _aisle = 0;
        string _location;
        foreach (GridViewRow  row in GridView1.Rows)
            _number = Convert.ToString(GridView1.FindControl("Number"));
            _pallets = Convert.ToInt32(GridView1.FindControl("Pallets"));
            _julien = Convert.ToInt32(GridView1.FindControl("Julien"));
            _location = Convert.ToString(GridView1.FindControl("Location"));
            WarehouseAdapter.Update(_number, _pallets, _cases, _julien, _aisle, _location);

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Debug using a breakpoint and check at each row what's getting updated. Maybe you'll come to know what and where the problem is.
instead of
_number = Convert.ToString(GridView1.FindControl("Number"));

try this
_number = Convert.ToString(row.FindControl("Number"));

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