Readonly and constant members

    8   public class TestClass

    9   {

   10     const string constString = "this is a const string";

   11     readonly string readonlyString = "this is a readonly string";

   12 

   13     public TestClass()

   14     {

   15       Console.WriteLine("constString value: {0}", constString);

   16       // constString = "abc"; <- can't change value, throws error

   17 

   18       Console.WriteLine("readonlyString initial value: {0}", readonlyString);

   19 

   20       // you can change the readonly variable value in constructor

   21       readonlyString = "new value for readonly string";

   22 

   23       // output:

   24       // readonlyString new value: new value for readonly string

   25       Console.WriteLine("readonlyString new value: {0}", readonlyString);

   26     }

   27   }