Monday, June 02, 2008

Generating Sequence Number in DataGrid with Paging

Source: http://www.extremeexperts.com/Net/CodeSnippets/GeneratingSeqNumber2.aspx

In my previous article(  Generating Sequence Number in DataGrid) , i have explained how to generate sequence number (row number) in a DataGrid. This method can be easily implemented in DataGrid if there is no paging involved in that DataGrid. But same wont work in DataGrid, if paging is also there in DataGrid. To know how to do paging in DataGrid, refer this article Paging in DataGrid

If you implement this method, in the all the pages Sequence number will start from one only. But our requirement is not that, sequence number has to continue in all the pages.

For example if i am going to second page with Pagesize 10, then sequence number  should start from 11. To achieve this result we need to slightly tweak our previous method. Code snippet for implementing this method is,   

<asp:DataGrid id="DataGrid1" runat="server" PagerStyle-Mode=NumericPages   PageSize="10" AutoGenerateColumns="False" AllowPaging="True">
      <Columns>
           <asp:templatecolumn headertext="Row Number">       
                  <itemtemplate>                   
                        <%# (DataGrid1.PageSize*DataGrid1.CurrentPageIndex)+ Container.ItemIndex+1%>
                 </itemtemplate>                 
            </asp:templatecolumn>           
            <asp:boundcolumn   runat="server" DataField="CompanyName" HeaderText="Company Name">                    
            </asp:boundcolumn>                   
            <asp:boundcolumn runat="server" DataField="Address" HeaderText="Address">           
             </asp:boundcolumn>         
    </Columns>
</asp:DataGrid>

Tweak in the code is very simple, instead of only using container.itemindex to get the sequence number. You need to use Pagesize and currentpageindex to find out the starting number of that page and then add container.itemindex to that. Then your sequence number will look like the following fig for second page,

 


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