protected void btnLoad_Click(object sender, EventArgs e)
{
MemoryStream collapseStateStream = (MemoryStream)(Session["CollapseStateStream"]);
string layout = (string)(Session["Layout"]);
if (layout == null ||
collapseStateStream == null)
{
return;
}
ASPxPivotGrid1.LoadLayoutFromString(layout, PivotGridWebOptionsLayout.DefaultLayout);
collapseStateStream.Seek(0, SeekOrigin.Begin);
ASPxPivotGrid1.LoadCollapsedStateFromStream(collapseStateStream);
}