c# - Error: System.Windows.Controls.UIElementCollection' does not contain a definition for 'OfType' -

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i want delete ellipses wpf canvas. used method :

public void clearcircle() {     var circles = cvssurface.children.oftype<ellipse>().tolist();     foreach (var c in circles)     {         cvssurface.children.remove(c);     } }

but, error on .oftype :

'system.windows.controls.uielementcollection' not contain definition 'oftype' , no extension method 'oftype' accepting first argument of type 'system.windows.controls.uielementcollection' found.

do need include something? i'm using .net 4.5

do need include something?....

yes, need include system.linq namespace explained here.


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