View Compilation Error

0_0_19267177_24221.cpp:1:7: error: expected nested-name-specifier before 'System'
 using System;
       ^
0_0_19267177_24221.cpp:2:7: error: expected nested-name-specifier before 'System'
 using System.Collections.Generic;
       ^
0_0_19267177_24221.cpp:3:7: error: expected nested-name-specifier before 'System'
 using System.Linq;
       ^
0_0_19267177_24221.cpp:4:7: error: expected nested-name-specifier before 'System'
 using System.Web;
       ^
0_0_19267177_24221.cpp:5:7: error: expected nested-name-specifier before 'System'
 using System.Data.SqlClient;
       ^
0_0_19267177_24221.cpp:6:7: error: expected nested-name-specifier before 'System'
 using System.Data;
       ^
0_0_19267177_24221.cpp:11:1: error: expected unqualified-id before 'public'
 public class DsCategoryDAL:IDsCategoryDAL
 ^