Grid View Sorting When Using Dataset

<asp:GridView ID=" gvSorting " SkinID="GridView" EmptyDataText="No Records to Display" runat="server" AutoGenerateColumns="true" Width="100%" OnSorting="gvSorting_Sorting" AllowSorting="True"></asp:GridView>

In .cs Page

When Binding Grid

gvSorting.DataSource = Dt;

gvSorting.DataBind();

Session["_Dt"] = Dt;

ViewState["Sort_Order"] = "ASC";

protected void gvSorting_Sorting(object sender, GridViewSortEventArgs e)

{

if (ViewState["Sort_Order"].ToString() == "ASC")

RebindData(e.SortExpression, "DESC");

else

RebindData(e.SortExpression, "ASC");

}

private void RebindData(string sColimnName, string sSortOrder)

{

DataTable dt = (DataTable)Session["_Dt"];

dt.DefaultView.Sort = sColimnName + " " + sSortOrder;

gvSorting.DataSource = dt;

gvSorting.DataBind();

ViewState["Sort_Order"] = sSortOrder;

}