getting image type

i m getting image properties from database
but this work is easy with if we load image from disk
but loading an image from data base then getting its properties is still dificult task.
this is the showproperties method which gets image from data base and shows its properties in a list view

Code:

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Private Sub ShowProperties(ByVal item As TreeItem)
        Try
            ' Create a command to select the selected photo
            Dim strCmd As String = [String].Format("SELECT photo FROM Photos WHERE id = {0}", item.Id)
            Dim cmd As New SqlCommand(strCmd, SqlConn)
            ' Get bytes return from stored proc
            Dim b As Byte() = CType(cmd.ExecuteScalar(), Byte())
            If b.Length > 0 Then
                ' Open a stream for the image and write the bytes into it
                Dim stream As New System.IO.MemoryStream(b)
                Dim img As Image
                img = Image.FromStream(stream)
                listView1.Items.Clear()
                listView1.Items.Add(New ListViewItem(New String() {"Type", GetImageTypeName(img.RawFormat)}))

                listView1.Items.Add(New ListViewItem(New String() {"Resolution", img.Size.Height & " * " & img.Size.Width & " Pixels"}))
                listView1.Items.Add(New ListViewItem(New String() {"Height", img.Height.ToString() & " Pixels"}))
                listView1.Items.Add(New ListViewItem(New String() {"Width", img.Width.ToString() & " Pixels"}))
                listView1.Items.Add(New ListViewItem(New String() {"Horizontal Resolution", img.HorizontalResolution.ToString() & " Pixels/Inch"}))
                listView1.Items.Add(New ListViewItem(New String() {"Vertical Resolution", img.VerticalResolution.ToString() & " Pixels/Inch"}))
                listView1.Items.Add(New ListViewItem(New String() {"Pixel Format", img.PixelFormat.ToString()}))
                listView1.Items.Add(New ListViewItem(New String() {"Palette Flags", img.Palette.Flags.ToString()}))
                listView1.Items.Add(New ListViewItem(New String() {"Raw Format", img.RawFormat.ToString}))

                ' Draw photo to scale of picturebox
                DrawToScale(New Bitmap(stream))

                ' Close the stream and delete the temp file
                stream.Close()
            End If
        Catch e As Exception
            MessageBox.Show(e.Message)
        End Try
    End Sub

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and second function is GetImageTypeName which is used for getting image data type

Code:

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Private Function GetImageTypeName(ByRef ImageFormat As System.Drawing.Imaging.ImageFormat) As String
        Dim sType As String
        Select Case True
            Case Object.Equals(System.Drawing.Imaging.ImageFormat.Bmp, ImageFormat)
                sType = "BMP"

            Case Object.Equals(System.Drawing.Imaging.ImageFormat.Bmp, ImageFormat)
                sType = "EMF"
            Case Object.Equals(System.Drawing.Imaging.ImageFormat.Bmp, ImageFormat)
                sType = "EXIF"
            Case Object.Equals(System.Drawing.Imaging.ImageFormat.Bmp, ImageFormat)
                sType = "GIF"
            Case Object.Equals(System.Drawing.Imaging.ImageFormat.Bmp, ImageFormat)
                sType = "ICON"
            Case Object.Equals(System.Drawing.Imaging.ImageFormat.Bmp, ImageFormat)
                sType = "JPEG"
            Case Object.Equals(System.Drawing.Imaging.ImageFormat.Bmp, ImageFormat)
                sType = "PNG"
            Case Object.Equals(System.Drawing.Imaging.ImageFormat.Bmp, ImageFormat)
                sType = "TIFF"
            Case Object.Equals(System.Drawing.Imaging.ImageFormat.Bmp, ImageFormat)
                sType = "WMF"
            Case Else
                sType = "UNKNOWN"
        End Select
        Return sType

    End Function

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but problem is that when i select an image its image type is displayed to "UNKNOWN"
and similarly i want to get image size
kindly tell me how can I get perfect image type and its size in KB ...thanks

Have you actually read your code? Every single one of your cases is testing for BMP, so everything that isn't a BMP will come back as unknown.