protected void gvBookResult_Sorting(object sender, GridViewSortEventArgs e)
{
if (siForGv == null)
{
return;
}
GridView SortGv = (GridView)sender;
siForGv.SortExpression = e.SortExpression;
int page = SortGv.PageIndex;
siForGv.SortDataBind(SortGv, page, false);
}