Sorting a GridView that is detached from database and put in a cache

First, the GridView needs to have sorting enabled and a sorting method:

                    <asp:GridView ID="GridView2" runat="server"
                        OnSorting="GridView2_Sorting" AllowSorting="True">                        
                    </asp:GridView>

Next, the page load and sorting method need to be implemented. I loaded my data from another GridView at the load. There is a Label that is also used. This code is similar to this reference link.

    protected void Page_Load(object sender, EventArgs e)
    {
        DataView myDataView;

        // Retrieve the DataView object from Cache. If not exist, then add DataView object to the Cache.

        myDataView = (DataView)Cache["MyDataSet"];

        if (myDataView == null)
        {
            myDataView = getTable().DefaultView;
            Cache["MyDataSet"] = myDataView;
            myDataView.Sort = myDataView.Table.Columns[0].ToString() + " ASC";
            lblCacheMsg.Text = "Dataset created explicitly";
        }
        else
        {
            lblCacheMsg.Text = "Dataset retrieved from cache";
        }
        GridView2.DataSource = myDataView;
        GridView2.DataBind();
    }

// Verbose sort version
    protected void GridView2_Sorting(object sender, GridViewSortEventArgs e)
    {
        DataView Source = (DataView)Cache["MyDataSet"];
        string direction = " DESC";
        string curDirecton = Source.Sort.ToString().ToUpper();
        if (curDirecton.Contains(direction))
        {
            direction = ASC;
        }
        else
        {
            direction = DESC;
        }        
        Source.Sort = e.SortExpression + " " + direction;
        Cache["MyDataSet"] = Source;
        GridView2.DataSource = Source;
        GridView2.DataBind();
        lblE.Text = direction;
    }
    private DataTable getTable()
    {
        DataTable retVal;
        DataTableHelper dth = new DataTableHelper(GridView1);
        retVal = dth.getDataTable();
        return retVal;
    }