Question

I have two private lists that need to be initialized when object is created. Second list is dependent on first one. Can I do it like this:

  public class MyClass
  {
      private List<T> myList = new List<T>();
      private ReadOnlyCollection<T> myReadOnlyList = myList.AsReadOnly;

      ...
  }

Second list is read only wrapper around first one.

Can I expect that c# will execute this two lines in this order each time it is run?

Or should I put this initializations in constructor?

Edit:
Sorry for stupid question. I tried it and compiler says:

Error   1   A field initializer cannot reference the 
             non-static field, method, or property...

Answer 1

No. If you want to initialize a variable based on a separate variable within the class, you need to do this in the constructor:

public class MyClass 
{ 
    private List<T> myList = new List<T>(); 
    private ReadOnlyCollection<T> myReadOnlyList;
    public MyClass()
    {
        myReadOnlyList = myList.AsReadOnly; 
    }

} 

Inlined intializers are always run in a static context, which means you have no access to member variables within your class. Inside of a constructor, however, you can do this. The inlined initializers will occur before your constructor, which is why I could leave the list initialization in place.