How to inherit to properties to a web page in asp.net

Hi,

I want to set useraccess permission for webforms.I want to have a common class say userClass for that function where priviliges are set for eg(canAdd,canDelete,canEdit etc).

From the webform i need only to check the properties such as canAdd,canDelete,canEdit are true or false.According to that priviliges are set.

I dont want to call the userClass function on every page load.It should be automatically called when the page gets loaded.