How Do I Page Index For The Images In Gridview. C# .Net

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C#

.NET

Gridview

Hi guys,i have written a grid view to display image and a datafield,the problem is i am not able to get index for the images.
how to call Gridview1_Ondatabound in indexing?

protected void GridView1_OnDataBound(object sender, GridViewRowEventArgs e)
    {
        string imglac;
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            imglac = e.Row.Cells[0].Text;
            (e.Row.Cells[1].FindControl("Image") as Image).ImageUrl = "~/upload/images/" + imglac;
        }
    }

    protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        GridView1.PageIndex = e.NewPageIndex;
        this.GetData();

    }