title: Is that possible to generate unique Id for list item across site collection?
body: <p>Ex: I have 10 sites and every site have 5 list. From site 1 i have adding one item in listX now id will be like "1" and creating another item in listB of 4th sub site so now id will "2"... So it has to go on like this how to achieve this?</p>
  
  <p>I need to update this with all list item added event ? also how to get the latest id?</p>