Asynchronously add value to Bindinglist/Cross-threading & Locking issue?

I think you should change your BeginInvoke to just Invoke . You need to get it on the UI thread, not begin an async operation. Otherwise your lock could get released before the BeginInvoke target gets invoked because control is returned immediately upon calling BeginInvoke .

Calling Invoke will block that thread on that call until the Invoke target completes then return control back to your thread, which will ensure the lock is kept.

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