This event occurs when a transaction is about to begin.

This method allows designer host clients to perform operations before other handlers are notified that a transaction has begun. The specified handler is called only when the first call to IDesignerHost.CreateTransaction is made. Subsequent calls do not generate this event until all transaction objects have been disposed.

Namespace: System.ComponentModel.Design
Assembly: System (in System.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0, 4.0.0.0