In reference to your questions:
- You need to use the OnClientItemSelected event of the RadFileExplorer control. This demo shows how to attach and use the events.
- The GetFile method of the FileBrowserContentProvider is used in order to determine whether a file exists or not. If this method returns null (Nothing in VB.NET), this means that the file does not exists. It safe to override this method always to return null, because RadFileExplorer control calls this method only in order to check whether file exists or not .
All the best,
the Telerik team
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