adrotator

hi guys i am just trying to ad a adrotator control in my web page but the thing is i am unable to see the ad after executing the web page i have added xml data source to add and i have set the advertisementfile property of that adrotator to the same file as datasource file my xml file is like this - - C:\Users\Nani\Documents\hems.jpg http://www.microsoft.com Alt Text Computers 80 - C:\Users\Nani\Documents\Presentation1.jpg http://www.microsoft.com Alt Text Computers 80 i dont know why i cant view this ad can any one help me thanks in advance