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();
  }
}