How to detect using c# if a pendrive is plugged into a USB port?

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[Assuming Windows, given the C# remark. Please tag accordingly]

Yes, this is possible. And it is possible to get the details of the file. It will require programming, though. Watch for WM_DEVICECHANGE and re-enumerate drives afterwards. It will get you USB pendrives, but also SD cards. I expect that’s a bonus for you.

To get more details once you know a drive has arrived, use System.IO.FileSystemWatcher

Update
I found a better solution – if you register for volume interface notifications, you’ll get the volume path for the new drive.
First, create a DEV_BROADCAST_DEVICEINTERFACE with dbcc_classguid=GUID_DEVINTERFACE_VOLUME. Then pass this to RegisterDeviceNotification(). You will again get a WM_DEVICECHANGE but you can now cast the lParam from the message to DEV_BROADCAST_DEVICEINTERFACE*.

You can pass the dbcc_name you receive to GetVolumeNameForVolumeMountPoint(). You can also pass all drive letters from GetLogicalDriveStrings() to GetVolumeNameForVolumeMountPoint(). You’ll have one matching volume name; this is the new drive.

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