GridView C# Question

[BrianDH]

I have a aspc page wotjing with a dataset from a web service call. I bind
the data to my grid. That all works.
I now want the grid to page & sort.
I can get it to page and or sort but not both.
If I sort my viewed records they sort but when I go to next page i lose my
sort.
protected void RequestsGridVie w_Sorting(objec t sender,
GridViewSortEve ntArgs e)
{
DataView dv = new DataView();
dv = (DataView)Cache["RequestsGridVi ew"];
if ((string)Sessio n["filter"] == "1")
{
dv.Sort = e.SortExpressio n + " DESC ";
Session["filter"] = "0";
}
else
{
dv.Sort = e.SortExpressio n;
Session["filter"] = "1";
}
RequestsGridVie w.DataSource = dv;
RequestsGridVie w.DataBind();
}
protected void RequestsGridVie w_PageIndexChan ging(object sender,
GridViewPageEve ntArgs e)
{
RequestsGridVie w.PageIndex = e.NewPageIndex;
RequestsGridVie w.DataBind();
}
}
My Question: How Can I page thru the data in my grid after sorting and keep
the sort filter?