.net - ObjectDataSource Paging -> no data displayed in GridView -

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i have objectdatasource , gridview configured shown below (using vs2008 w/ .net3.5):

    <asp:objectdatasource id="odsmaindata" runat="server" enablepaging="true" oldvaluesparameterformatstring="original_{0}"         selectmethod="getmaindata" typename="errorviewer.model.errorviewmodel"          selectcountmethod="countmaindata">         <selectparameters>             <asp:parameter name="maximumrows" type="int32" />             <asp:parameter name="startrowindex" type="int32" />         </selectparameters>     </asp:objectdatasource>     <asp:gridview id="grdmaindata" runat="server" allowpaging="true"             datasourceid="odsmaindata" pagesize="15" allowsorting="true">     </asp:gridview>

there no eventhandlers or other code in code behind gridview or datasource

so there methods in underlying class "errorviewmodel": public datatable getmaindata() { var dt = provider.maindata(); mymaindata = dt; return dt; }

    public datatable getmaindata(int maximumrows, int startrowindex)     {         var dt = provider.maindata();         mymaindata = dt;         return dt;     }      public long countmaindata()     {         var count = provider.getmaindatacount();         return count;     }      public long countmaindata(int maximumrows, int startrowindex)     {         var count = countmaindata();         return count;     }

what want: custom server side paging. problem: when set enablepaging=true in datasource, there no data displayed in gridview. if enablepaging set false, there data displayed. can see, 2 methods retrieving data same. debugging shows, there rows returned when using enablepaging=true. strange thing (using enablepaging=true): in getmaindata maximumrows set 15 , startrowindex 0 in countmaindata maximumrows set 0 , startrowindex 0

i've implemented type of custom paging in project , did same configuration - time resides in strange behavior. wrong in implementation? did forgot 1 little setting? suggestions?

the mistake was, countmaindata didn't return integer. after changed countmaindata return integer, worked fine.


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