View Compilation Error

0_0_15157866_12709.cpp:7:1: error: stray '\312' in program
 namespace 视频学习
 ^
0_0_15157866_12709.cpp:7:1: error: stray '\323' in program
0_0_15157866_12709.cpp:7:1: error: stray '\306' in program
0_0_15157866_12709.cpp:7:1: error: stray '\265' in program
0_0_15157866_12709.cpp:7:1: error: stray '\321' in program
0_0_15157866_12709.cpp:7:1: error: stray '\247' in program
0_0_15157866_12709.cpp:7:1: error: stray '\317' in program
0_0_15157866_12709.cpp:7:1: error: stray '\260' in program
0_0_15157866_12709.cpp:1:7: error: expected nested-name-specifier before 'System'
 using System;
       ^
0_0_15157866_12709.cpp:2:7: error: expected nested-name-specifier before 'System'
 using System.Collections.Generic;
       ^
0_0_15157866_12709.cpp:3:7: error: expected nested-name-specifier before 'System'
 using System.Linq;
       ^
0_0_15157866_12709.cpp:4:7: error: expected nested-name-specifier before 'System'
 using System.Text;
       ^
0_0_15157866_12709.cpp:5:7: error: expected nested-name-specifier before 'System'
 using System.Threading.Tasks;
       ^
0_0_15157866_12709.cpp:11:26: error: 'string' has not been declared
         static void Main(string[] args)
                          ^
0_0_15157866_12709.cpp:11:35: error: expected ',' or '...' before 'args'
         static void Main(string[] args)
                                   ^
0_0_15157866_12709.cpp:31:5: error: expected ';' after class definition
     }
     ^
0_0_15157866_12709.cpp: In static member function 'static void {anonymous}::Program::Main(int*)':
0_0_15157866_12709.cpp:27:19: error: 'Convert' was not declared in this scope
            int  a=Convert.ToInt32(Console.ReadLine());
                   ^
0_0_15157866_12709.cpp:27:35: error: 'Console' was not declared in this scope
            int  a=Convert.ToInt32(Console.ReadLine());
                                   ^