I have found the solutions,
Using stream = New MemoryStream(.event_logo)
Dim bitmap = New BitmapImage()
bitmap.BeginInit()
bitmap.StreamSource = stream
bitmap.CacheOption = BitmapCacheOption.OnLoad
bitmap.EndInit()
bitmap.Freeze()
img_righteventlogo.Source = bitmap
End Using
I don't know what is the different between my post code and my answer code. But the answer works