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Praveen Kumar R 6Praveen Kumar R 6 

Any example code to use 'For Update' keyword to do record locking on a custom object?

I tried using the 'For update' keyword in apex controller SOQL query for locking the set of records of a custom object. But it's not working fine for me. Please share some example code for the keyword use case.
Praveen Kumar R 6Praveen Kumar R 6

Thanks for the details provided.
Can we try out the keyword in the apex controller where i call it from my 'Edit' button page for a custom object?
My scenario is to lock the records from the same time modifications by different users.