title: The event can only appear on the left hand side of = or -=
body: <p>i have some problem in this code.. anyone help me </p>
  
  <pre><code>public event EventHandler CollectionChanged
          {
              [MethodImpl(MethodImplOptions.Synchronized)]
              add
              {
                  this.CollectionChanged = (EventHandler)Delegate.Combine(this.CollectionChanged, value);
              }
              [MethodImpl(MethodImplOptions.Synchronized)]
              remove
              {
                  this.CollectionChanged = (EventHandler)Delegate.Remove(this.CollectionChanged, value);
              }
          }
  </code></pre>
  
  <p>regards
  sarva</p>