What is the best option, transaction locking for distributed systems?

I am using NHibernate and really new to that. My dilemna is when I open a web browser, it shows the table data. Meantime another person opens another web browser and hence r开发者_开发问答ead the existing data from the database.

Meantime, I make changes in the my pages and save. And the user save his changes afterwards. When I reload the page, I no more find my data, but that of the user, i.e his was the latest and mine were replaced.

How can I avoid this issue?

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You need to implement optimistic concurrency control: http://nhibernate.info/doc/nhibernate-reference/transactions.html#transactions-optimistic

The most performant way is adding a <version> to your entities (see http://nhibernate.info/doc/nhibernate-reference/mapping.html#mapping-declaration-version)