Bind N Tables to one GridView Without SQL Joining

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C#

ASP.NET

Gridview

i have some tables that each one have different columns like this :
http://i.stack.imgur.com/BXA31.png[
href="http://i.stack.imgur.com/BXA31.png" target="_blank" title="New Window">^]

each User ( have ID ) can post to my website and Add some events, so each update goes to related table! but my problem is how show this information only in one Gridview . its something like facebook Timeline that shows your updates sorted by date .
i tried to use SQL join but its not a good way because i have 10 to 12 tables, joining all these tables is time consuming.
i want have a gridview that be bind from different tables on sort the information by their date ( each table have a date column )
sorry for my bad English.