using System;
namespace YourNamespace
{
   //类 class YourClass { }    //结构 struct YourStruct { }    //接口 interface IYourInterface { } //委托 delegate int YourDelegate();    //枚举   enum YourEnum { }   //命名空间 namespace YourNestedNamespace { struct YourStruct { } }    //类型 class YourMainClass { static void Main(string[] args) { //Your program starts here... } } }