public class Test
{
 public readonly string name = "George";
 public const string coname = "ABC Company LLC";
 public Test(string name)
 {
  // readonly 修饰的变量能且只能在 Constructor（构造函数）中被改变 
  this.name = name;
 }
 public string _name
 {
  get
  {
   return name;
  }
  //不可以对readonly修饰的变量进行Set操作 
  //set  
  //{  
  // name = value; 
  //}  
 }
}
 
class Program
{
 static void Main(string[] args)
 {
  Test obj = new Test("Test");
  //readonly的变量不可以修改值，只能在 Constructor（构造函数）中被改变  
  //obj.name = "New Value";   
  Console.WriteLine(obj.name);  
  //const 的变量直接通过对象访问，不需要实例化 
  Console.WriteLine(Test.coname);
  Console.Read();
 }
}