data pager in list view in asp.net

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ASP.NET

Hello all,

sir i put a list view data pager in my website
bt when i run that page total 4 pages in the pager when
i clicking the next link the first page appear two time and 3 and 4 page appear only once.
but when i click on previous page all 4 pages appear only once
the other problem is when i click on the first page link the first page dont appear on single click
and the same problem is with the last page link



here is the datapager code

<asp:DataPager ID="pageProducts" PageSize="4" PagedControlID="lvSubCategory" runat="server">
   <Fields>
             <asp:NextPreviousPagerField ButtonType="Link" ShowFirstPageButton="True" FirstPageImageUrl="~/Thumbs/1121.jpg"
               ShowNextPageButton="false"/>
              <%--  <asp:NumericPagerField />--%>
                <asp:NextPreviousPagerField ShowLastPageButton="True" LastPageImageUrl="~/Thumbs/AEI-5703.jpg"
             ShowPreviousPageButton="false" />

</Fields>
</asp:DataPager>




sir please help me out
thanks and regard
subiya