Image byte array

In the code below to load an image to a datarow i would like to understand why i need create a memory stream and then convert to byte array.

 Dim ms As System.IO.MemoryStream = New System.IO.MemoryStream
                PicLogotipo.Image.Save(ms, PicLogo.Image.RawFormat)
                datarow1("Logo") = ms.ToArray

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