Update Title column in the TFS2010 SQL database,then go to refresh the item on the UI, no change..is it a bug?

Hello everyone,

I want to update a huge number of workitems' title, I don't want to change one by one on the UI, I aslo dont want to write a API program to update it, so I go to update the SQL DB directily.

steps:

1. SQL: "update WorkItemsAre set Title = 'updated title' where ID = 17"

2. Go work item ID=17

3. Refresh the item or close it and reopen.. the title keep the same..

4. I change another filed value, save it ,then refresh the item agian, the title update to "updated title".

I have viewed someothers said it is not alowed to change the value by the SQL DB in TFS, but i am not sure about it..

Appreciate ahead!

thanks~

-Ma Wei