Unwire an event

[Quercus]

I am developing a data bound control and am trying to handle the IBindingList.ListChanged event.

 

Originally, my control's constructor had

MyBindingList.ListChange += new ListChangedEventHandler(MyBindingList_ListChanged);

But the compiler didn't like it because when the control instance is first created, MyBindingList is null because it hasn't been assigned yet, and might not be for some time, or never if the user doesn't use data binding.

 

So I presume that I need to move my event wiring to the method that detects if my data source supports IBindingList. If the data source does, then wire the event. If it doesn't, then unwire the event.

 

Question #1: Am I on the right track?

Question #2: If so, how do I unwire an event?

 

The compiler didn't like MyBindingList.ListChanged =- ListChangedEventHandler; or variations on that theme.

 

object MyDataSource;    // Assigned elsewhere.
IBindingList MyBindingList;

private void AssociateBindingList()
{
   if (MyDataSource is IBindingList)
   {
       MyBindingList = (IBindingList)MyDataSource;
       MyBindingList.ListChanged += new ListChangedEventHandler(MyBindingList_ListChanged);
   }
   else
   {
       // Unwire old event if necessary somehow
       // HELP!!!!!!!
       MyBindingList = null;
   }
}

private void MyBindingList_ListChanged(object sender, ListChangedEventArgs e)
{
   // Refresh data
}

Suggestions? Pointers?

Thanks.