c# - Set image position on canvas programatically -

i have following code:

namespace game {     public partial class mainwindow : window     {         image img = new image();          public mainwindow()         {             initializecomponent();             mycanvas.focus();              img.source = new bitmapimage(new uri("c:\\users\\public\\pictures\\sample pictures\\koala.jpg"));             img.width = 100;             img.height = 100;                       }          public void onkeydownhandler(object sender, keyeventargs e)         {             canvas.settop(img, 0);             canvas.setleft(img, 0);             this.content = img;          }     } } 

and xaml:

 <canvas name="mycanvas" keydown="onkeydownhandler" focusable="true" horizontalalignment="left" height="166" margin="118,89,0,0" verticalalignment="top" width="300"/> 

when press button, image shown, want do, in center of window. want set image on x,y position want. how do that?

<canvas>     <image x:name="foo" canvas.top="200" canvas.left="200" /> </canvas>  foo.setvalue(canvas.left, 100); foo.setvalue(canvas.top, 225); 

this basic test scenario. sets image image.setvalue(canvas.position, int) says so.