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Is manual locking necessary?

I have a window application with SQL 2005 database in a not bound to database
mode.
The application is to be in a multi-user environment.
How am I meant to maintain locking?
Should be considered:
1. the main form displays data from many tables
2. I don't want two users to open the same data for updates.
3. The form may be open for a long time (even hours)
4. The user should not loose any data entered and not yes saved ,because by
the time he comes to save it, the data was changed by somebody else.

Oct 12 '08 #1
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