C # implement the Oracle paging Function

public class PageUtil{    // Methods    public static DataView GetListForPage(int index, int pagesize, string tabname, string key, string condition, string sortindex, ref int count)    {        int rscount = 0;        StringBuilder strSql = new StringBuilder();        OracleDataReader sdr = null;        if (condition.Length > 0)        {            condition = " and " + condition;        }        strSql.Append("select count(*) from " + tabname + " where 1=1" + condition);        sdr = DbHelperOra.ExecuteReader(strSql.ToString());        if (sdr.Read())        {            rscount = Convert.ToInt32(sdr[0]);        }        sdr.Close();        count = rscount;        int maxpage = ((rscount + pagesize) - 1) / pagesize;        if ((index + 1) >= maxpage)        {            index = maxpage - 1;        }        if (index < 0)        {            index = 0;        }        int start = (index * pagesize) + 1;        int end = ((index + 1) * pagesize) + 1;        string sql = "SELECT * FROM (SELECT A.*, ROWNUM RN FROM (SELECT * FROM " + tabname + " where 1=1 " + condition + " order by " + sortindex + " desc) A WHERE ROWNUM < " + end.ToString() + ") WHERE RN >= " + start.ToString();        DataSet ds = new DataSet();        ds = DbHelperOra.Query(sql);        if (ds.Tables.Count > 0)        {            return ds.Tables[0].DefaultView;        }        return null;    }}