I want to prevent duplicate file names in a document library.

Let me know how can I enforce the unique names in the library.

Thanks RH

1 Answer 1


Create an event receiver for the library on the ItemAdding, check if an item with that name already exist => if this is true add this code :

properties.Cancel = true;
properties.ErrorMessage = "Adding duplicate is not alowed.";

or use this : http://social.technet.microsoft.com/Forums/en-US/sharepointdevelopment/thread/301f3a11-498a-4cf7-93f1-774a032606d0

  • Your answer is correct but I have a more complicated scenario
    – RHM
    Commented Mar 2, 2012 at 12:29

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