[VB.NET] Blob data corrupt of PNG image

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VB

Hi all,

I have one inquiry here. Why my PNG data not showing IF I update the byte from memory stream? If I use INSERT statement, the PNG image can be view..if I use UPDATE statement to replace the current BLOB data, it will show black image on my WinForm..


* Update JPG file, it work fine. Update PNG, it show updated but when to view, it not appear as exact.

Please share your idea or experience to me. Thanks