c# - Changing bitmap image dynamically -

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i'm having issues of having bitmap image change dynamically between usercontrol , page load.

i'm using dispatcher timer keep image changed. not work. error stated urisource null.

i'm using ms visual studio 2012, metro application c#

code in usercontrol xaml:

    <image x:name="img">         <image.source>             <bitmapimage urisource="{binding path=bitmapimage}" />         </image.source>     </image>

code in usercontrol:

        public bitmapimage bitmapimage         {              { return _bitmapimage; }             set             {                 if (_bitmapimage == value) return;                 _bitmapimage = value;                  raisepropertychanged("bitmapimage");             }          }      public event propertychangedeventhandler propertychanged;      private void raisepropertychanged(string propertyname)     {         if (propertychanged != null)         {             propertychanged(this, new propertychangedeventargs(propertyname));         }     }

codes in page load:

    int eyesstate = 1;      private void minionanimation_tick(object sender, object e)     {       if (eyesstate == -1)         {              ghosts[0]._bitmapimage.urisource = new uri(this.baseuri, @"assets/test.png");         }         else         {             ghosts[0]._bitmapimage.urisource = new uri(this.baseuri, @"assets/test2.png");         }          eyesstate *= -1;     }

try:

xaml:

<bitmapimage urisource="{binding path=bitmapimageuri}" />

code:

private uri _bitmapimageuri; public uri bitmapimageuri {     { return _bitmapimageuri; }     set     {         if (_bitmapimageuri == value) return;         _bitmapimageuri= value;         raisepropertychanged("bitmapimageuri");     } }

in timer:

ghosts[0].bitmapimageuri = new uri(this.baseuri, @"assets/test.png");

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