title: List of datatype variable in class won't be updated
body: <p>i've create a class having List as a property
  here's the code</p>
  
  <pre><code>public class ScreenEventNTF
  {
      //property
      public List&lt;string&gt; list_event_string { get; set; }
  
      //constructor
      public ScreenEventNTF(blah blah)
      {
         list_event_string = new List&lt;string&gt;();
      }
  
      // the not-working method
      public void AddToStringTodraw(string string_inp)
      {
          list_event_string.Add(string_inp);
  
      }
  
  }
  </code></pre>
  
  <p>from the main class i do something like</p>
  
  <pre><code>ScreenEventNTF notifier = new ScreenEventNTF(blah blah);
  notifier.AddToStringTodraw("Fabulous");
  </code></pre>
  
  <p>and i try to write all the string in notifier.list_event_string  but it didn't seem to
  have any value stored in the List</p>
  
  <p>here's the code  according to the coments.</p>
  
  <pre><code>foreach (string text in notifier.list_event_string)
   spriteBatch.DrawString(font_test, text , 
                  vector_mouse, Color.White, 0f, Vector2.Zero, 1.0f, SpriteEffects.None, 1.0f);
  </code></pre>
  
  <p>what am i doing wrong ??  </p>
  
  <p>please help me, any help will be appreciate.</p>