It's possible.
Please follow the steps below.
1. Get the UserID, for example, the current userID is "John_smith"
2. For John_smith, you want his gallery path is "~/upload/John_smith"
3. In your code, first you need to detect whether the path exists or not, if not, you need to create it dynamically.
4. Now you can set gallery1.FolderPath = ""~/upload/John_smith".
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