grid view page index

[mrcooll]

hi all, how can i maintain gridview page index while navigation from the form and getting back by browser back button. i tried to use this approach:

public int PageIndex
{

    get
    {
        if (Session\["DGApplicationPageIndex"\] != null)
        {
            return (int)Session\["DGApplicationPageIndex"\];
        }
        else
        {
            return 0;
        }
    }
    set
    {
        if (value != -1)
        {
            Session\["DGApplicationPageIndex"\] = value;
        }
        else
        {
            Session\["DGApplicationPageIndex"\] = null;
        }

    }

}

protected void DGApplication_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
DoSearch(TextBox1.Text);
DGApplication.PageIndex = e.NewPageIndex;
PageIndex = DGApplication.PageIndex;
}

protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
DoSearch("-1");
}
DGApplication.PageIndex = PageIndex;
PageIndex = -1;

}

[Not Active]

And what happens with this? Why reset the page index?? PageIndex = -1;

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