How to get which page is clicked by the user in gridview paging using C# code

below is my pageindexchanging method the total which i am getting in ViewState["Result1".tostring() should be binded to last page of my gridview how can i do this can anyone help me out
protected void grd_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
DataTable dt = (DataTable)ViewState["grd"];
if (dt.Rows.Count > 0)
{
grd.PageIndex = e.NewPageIndex;
grd.DataSource = dt;
grd.DataBind();

grd.FooterRow.Cells[6].Text = "Total:";
grd.FooterRow.Cells[6].HorizontalAlign = HorizontalAlign.Left;
grd.FooterRow.Cells[7].Text = ViewState["Result1"].ToString();
grd.FooterRow.Cells[6].Font.Size = 15;
grd.FooterRow.Cells[7].Font.Size = 15;
}
else
{
grdUser.DataSource = null;
grdUser.DataBind();
}
}