Is an event:

 
The public event EventHandler ItemSelected; 

The default add method is like this:

 
ListViewMenu. ItemSelected +=async (sender, e)=& gt; 
{
If (e.S electedItem==null) 
return; 

Var id=(int) ((HomeMenuItem) e.S electedItem). The id; 
Await RootPage. NavigateFromMenu (id); 
}; 

I want to change a name, suggesting the return value is not correct, the return method is a Task of asynchronous synchronization method is void,
If I don't want the event to sync, that should be how to write

 
ListViewMenu. ItemSelected +=new EventHandler (ListViewMenu_ItemSelected); 
Private async Task ListViewMenu_ItemSelected (object sender, SelectedItemChangedEventArgs e) 
{
If (e.S electedItem==null) 
return; 

Var id=(int) ((HomeMenuItem) e.S electedItem). The id; 
Await RootPage. NavigateFromMenu (id); 
}