FileUpload to db 防止 null 問題

If fileUpload1.HasFile Then
Dim File As HttpPostedFile = fileUpload1.PostedFile
imgByte = New [Byte](File.ContentLength - 1) {}
File.InputStream.Read(imgByte, 0, File.ContentLength)
myNews.Image = imgByte
Else
myNews.Image = Nothing
end if

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以上code重點在必須加myNews.Image = Nothing