c# - Cannot using Linq function with Bing API sdk on Winforms -


I am using a large API SDK on a Winform application (Winform and not WPF!).

I am able to add pushpins. I would like to remove some pushpins.

I saw some Linux method, but I am not able to compile because "first" is not found. : var pushpin = MyMapUserControl.MyMap.Children.First (p => (P. gatetype =) Typef (flowerpin) & amp; amp; ((fluffen) p) . == "Search Metallurator")); MyMapUserControl.MyMap.Children.Remove (pushpin);

My error: 

  There is no definition for 'first' in 'System.Windows.Controls.UIElementCollection' and no extension method 'first' 'System.Windows.Controls.UIElementCollection' has been found for the first argument.   
 I include in:  
  using System.Linq;   
 Can anyone help me?   
 
 
  implements the system .windows.Controls.UIElementCollection   IEnumerable  but not  IEnumerable & lt; UIElement & gt; , therefore Linq methods do not apply directly because they only work on  IEnumerable & lt; T & gt;  Example.  
 There is a way that  PushPin  s is a  IEnumerable & lt; PushPin & gt;  as "Remove" ofType :  
  var pushpin = MyMapUserControl.MyMap Children OFTIP & lt; Pushpin & gt; (). First (p = & gt; p tag == "FindMeLater");

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