c# - WPF: Why MediaElement does not play? -

i want display video. want video play click on button. video not play. put video project.

i want video source youtube.

my xaml code is:

<window x:class="mediaelementapp.mainwindow"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     title="mainwindow" height="467.91" width="1300"> <grid>     <mediaelement x:name="mediaelement" horizontalalignment="left" height="418" margin="246,10,0,0" verticalalignment="top" width="1036" loadedbehavior="manual" unloadedbehavior="stop" source="images\wildlife.wmv" />     <button x:name="play" horizontalalignment="left" margin="538,161,0,0" verticalalignment="top" width="100" height="84" click="play_click" >         <button.background>             <imagebrush imagesource="images/smiley.jpg"/>         </button.background>     </button>  </grid> 

c# code:

using system; using system.collections.generic; using system.linq; using system.text; using system.windows; using system.windows.controls; using system.windows.data; using system.windows.documents; using system.windows.input; using system.windows.media; using system.windows.media.imaging; using system.windows.navigation; using system.windows.shapes;  namespace mediaelementapp { /// <summary> /// interaction logic mainwindow.xaml /// </summary> public partial class mainwindow : window {     public mainwindow()     {         initializecomponent();     }          private void play_click(object sender, routedeventargs e)         {              mediaelement.play();         }     } } 

i help.

the media source should file system example

mediaelement.source = new uri(@"c:\user\admin\images\wildlife.wmv")