paging

Hi,
I am fahim. I can load data in gridveiw. But I can't apply paging in it. I wrote the following code but It didn't work. Can anyone please solve my problem. I need a quick response and I request to all my forum friends please check this.
    protected void Gridview1_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        Gridview1.PageIndex = e.NewPageIndex;
        Gridload();//Load data again in Gridview

    }