//declaring a string array
 string[] strArrQuerystring;
 strArrQuerystring=new string[Request.QueryString.AllKeys.Length];

//getting the query string values into string array
        for (int i = 0; i < Request.QueryString.AllKeys.Length; i++)
        {
            strArrQuerystring[i] = Request.QueryString.Keys[i].ToUpper() + "," + Request.QueryString.GetValues(i)[0].ToString();
        }

//getting the query string values into dataset

        DataSet dsQueryString =QueryStringParser(strArrQuerystring);


 public DataSet QueryStringParser(string[] strArrayQueryString)
    {
        DataSet dsInputs = new DataSet();
        DataTable dtInputs = new DataTable();
        DataColumn dcColumn = null;        
        for (int i = 0; i < strArrayQueryString.Length; i++)
        {
            dcColumn = new DataColumn(strArrayQueryString[i].Split(',')[0].ToUpper());
            dtInputs.Columns.Add(dcColumn);
        }
        DataRow drInputs = dtInputs.NewRow();
        for (int j = 0; j < strArrayQueryString.Length; j++)
        {
            drInputs[j] = strArrayQueryString[j].Split(',')[1].ToString();
        }
        dtInputs.Rows.Add(drInputs);
        dsInputs.Tables.Add(dtInputs);
        return dsInputs;        
    }