I've added a GroupUserAdded event receiver to a SPWeb and confirmed the correct deployment via SharePoint Manager.

Additionally, the call to the receiver class is working fine when adding a user via SP Site Settings page People and Groups.

The caveat I'm experiencing right now - and couldn't find a fix for - is that programmatically adding a user to a group as follows won't trigger the event receiver. Any idea as though why this behaviour occurs would be appreciated.

var firstGroup = web.SiteGroups[0];
var adminUser = web.EnsureUser("administrator");

ty, Frank

  • The question can be closed. The event was fired correctly but the debugger was not attached to the correct process.
    – Frank M.
    Aug 22, 2018 at 12:22

1 Answer 1


Try adding System.Threading.Thread.Sleep(1000); after the Update. Sometimes async events are not triggering properly.

Similar case but with item event receiver: Programmatically changing a field won't trigger the event receiver

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