Hello Yiran,
From your description, it seems your issue is more related to VB .net. As you know, VB .net is not currently supported in the Microsoft Q&A forums, the supported products are listed over there: https://video2.skills-academy.com/en-us/answers/products/ (more to be added later on).
I suggest you can redirect and post a new thread to our MSDN Visual Basic forum.
Sincerely,
Tianyu
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