c# - Bitmap Image on Border not updating in UI -
i have wpf application images downloaded threadpool.queueuserworkitem(). in ui, have dispatchertimer, checks folder images supposed cached, , if found, suppose show them backgrounds 2 border elements , button element. i can see files getting downloaded filepath , can step through code creates bitmapimage object, not see rendered on screen. the relevant code pasted below.. <border x:name="leftimage" borderbrush="transparent" borderthickness="0" horizontalalignment="left" height="220" verticalalignment="top" width="99"> <button template="{staticresource leftarrow}" width="20" height="20" horizontalalignment="left" margin="10,0,0,0" /> </border> <border x:name="rightimage" borderbrush="transparent" bordert