How can I execute code when value of a variable changes in C#?

Question

I want to toggle a button's visibility in when value of a particular variable changes. Is there a way to attach some kind of delegate to a variable which executes automatically when value changes?

Answer 1

No, you can't do things like overloading assignment operator in C#. The best you could do is to change the variable to a property and call a method or delegate or raise an event in its setter.

private string field;
public string Field {
   get { return field; }
   set { 
       if (field != value) {
           field = value;
           Notify();
       } 
   }
}

This is done by many frameworks (like WPF DependencyProperty system) to track property changes.

Answer 2

Use Observer pattern. Here's another reference.