multiple user environment program

i have a problem about updating program that run on multiple user .

if i have a program that used concurrently by 2 user.
let say i want to update a record in a table,how can i lock that current records(Not table) only. so that another user cannot update to it until i realease it.

Pls provide me solutions.
TQ

thgAsked:
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rkot2000Connect With a Mentor Commented:
locking is not very good idea(plus you can not use locking with 3+ tiers or web client)

this is better solution  :
http://www.devx.com/premier/mgznarch/vbpj/1999/08aug99/pc0899.pdf
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Anthony PerkinsCommented:
Please maintain your open questions.  For the record:

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KarcOriginCommented:
Hi thg,

What is your backend?
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thgAuthor Commented:
let say a few client access to one SQL server.
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