View Compilation Error

0_0_16988693_1542.cpp:1:7: error: expected nested-name-specifier before 'System'
 using System;
       ^
0_0_16988693_1542.cpp:2:7: error: expected nested-name-specifier before 'System'
 using System.Web;
       ^
0_0_16988693_1542.cpp:3:7: error: expected nested-name-specifier before 'System'
 using System.Web.UI;
       ^
0_0_16988693_1542.cpp:4:7: error: expected nested-name-specifier before 'System'
 using System.Web.UI.HtmlControls;
       ^
0_0_16988693_1542.cpp:5:7: error: expected nested-name-specifier before 'System'
 using System.Web.UI.WebControls;
       ^
0_0_16988693_1542.cpp:12:5: error: expected unqualified-id before 'public'
     public class DemoCssCtrl : WebControl
     ^
0_0_16988693_1542.cpp:46:1: error: expected '}' at end of input
 }
 ^