c# - How to remove all the pages from page stack in Windows Phone 7? -

i know how remove old pages page stack.

navigationservice.removebackentry(); 

this remove last entry page stack.

but want remove pages form page stack.
if click clear button page should cleared.
please let me know idea solve this.

thanks in advance.

this how clear navigationservice backentry without getting exceptions:

while(navigationservice.cangoback)     navigationservice.removebackentry();