Paging Logic

I am trying to write a simple logic for paging the resultset of records.
It purely depends on a single querystring parameter like start = 161 or start=81
This would display records from 161 to 170 or 81 to 90.

        int nStart = 1;     //default start number i.e. very first record when first search hit.
        int newStart;
        string requestUri = Request.Url.AbsoluteUri;        //actual complete URL
        string newRequestUri;
       
        if (Request.QueryString["start"] != null)
            nStart = Convert.ToInt16(Request.QueryString["start"]);
       
        int nMaxResultsInAPage = 10;
        int pageNumber;             //current page number

        if (nStart == 1)        //initially not divisible by 10 as it is possible with page 2nd and record 11
            pageNumber = 1;
        else            //current page number....as start gives the record number
            pageNumber = nStart / 10;       // 2 = 21 / 10

       

        //j... ... ...refers to the paging number to be iterated
        //count... ... ...how many paging numbers to be shown in total for navigation

        for (int j = pageNumber - 10 / 2, count = 0;count <> 0)
            {
                newStart = (j-1) * 10 + 1;     //4th page represents records 31 to 40...so [4th Page] =  3 * 10 + 1
                newRequestUri = requestUri.Replace("start=" + nStart.ToString(), "start=" + Convert.ToString(newStart));
                if(count == 0)
                    ltrPageLinks.Text += " Previous   -  ";
                else if (count == 11)
                    ltrPageLinks.Text += " Next   -  ";
                else if (j == nStart / 10 - 1)
                    ltrPageLinks.Text += "" + j.ToString() + "  -  ";
                else
                    ltrPageLinks.Text += "" + j.ToString() + "  -  ";

               
            }
        }