In this demo, the RequestEditOperation event handler implements custom logic to determine whether an operation is allowed. The reason event parameter indicates whether the event was raised by user actions or a UI update. If a user tries to execute a prohibited action, an error message is displayed on-screen.
Local Copy of this Demo
To inspect the source code for this demo on your machine, you must first install our components via the DevExpress Component Installer.
You can open a local copy of this online demo directly from this webpage (if using v20.2.8, 21.1.4 or higher).
The source code files for this demo are installed (by default) in the following directory:
Open CS Solution
\Users\Public\Documents\DevExpress Demos XX.X\Components\ASP.NET\CS\MVCxDiagramDemos