string DetermineSelection(DataGridItem item, ref int count, string selectedItems)
        {
            CheckBox selection = (CheckBox)item.FindControlRecursive("SelectCheckBox");

            if (selection != null)
            {
                if (selection.Checked)
                {
                    string s = this.MyDataGrid.DataKeys[item.ItemIndex].ToString();
                    selectedItems += ", " + s + " ";
                    count++;
                }
            }
            if (selectedItems != "")
            {
                return(selectedItems.Substring(1));
            }
            else
            {
                return(selectedItems);
            }
        }