public void bookret(string query)
    {
        SqlDataAdapter da = new SqlDataAdapter(query, "server=.;database=MyLMS;user=sa;password=Ak11;");

        DataTable dt = new DataTable();

        da.Fill(dt);
        BookRetLV.DataSource = dt;
        BookRetLV.DataBind();
        con.Close();
    }
 protected void BookRetLV_PagePropertiesChanging(object sender, PagePropertiesChangingEventArgs e)
 {
     (BookRetLV.FindControl("DataPager1") as DataPager).SetPageProperties(e.StartRowIndex, e.MaximumRows, false);
     bookret("select * from BookIssueForm");
 }