want to open window on button click and then perform a button click event from code behind on the opened window web applicationc#

i have very basic requirement where i have to open a page (window) . then on the opened page , i have one link i want to perform a click event on that page , which will open another page. in c# web application is it possible to get the window object and then perform a search to get the link which i want to click .

i have tried to open window using javascript and then in code behind get the object of the opened page , but the page doesnt load at the time when server side code start to execute . i always get "Access is denied" error when i try to access the opened page .