Image Color Average - Update for VB .NET?

'Loading source image 
Dim bitmap As New Aurigma.GraphicsMill.Bitmap("x:/tests/Rgb24.jpg")
bv.Bitmap = bitmap

'Get histogram for each channel to calculate average
'intensity of an appropriate channel.

Dim histogram As Aurigma.GraphicsMill.Histogram
Dim avgRed, avgGreen, avgBlue As Integer

histogram = bitmap.Statistics.GetSumHistogram(Aurigma.GraphicsMill.ColorChannel.Red)
avgRed = System.Math.Round(histogram.Mean)
histogram.Dispose()

histogram = bitmap.Statistics.GetSumHistogram(Aurigma.GraphicsMill.ColorChannel.Green)
avgGreen = System.Math.Round(histogram.Mean)
histogram.Dispose()

histogram = bitmap.Statistics.GetSumHistogram(Aurigma.GraphicsMill.ColorChannel.Blue)
avgBlue = System.Math.Round(histogram.Mean)
histogram.Dispose()

'After we calculate average intensities of each channel,
'combine them into one RGB color.
Dim color As Aurigma.GraphicsMill.Color = Aurigma.GraphicsMill.Color.FromRgb(avgRed, avgGreen, avgBlue)

'Display this color. Let's draw the square 30x30 filled with average color
'we calculated. 

Dim g As Aurigma.GraphicsMill.Drawing.GdiGraphics = bitmap.GetGdiGraphics()
Try
        Dim brush As New Aurigma.GraphicsMill.Drawing.SolidBrush(color)
        g.FillRectangle(brush, 0, 0, 100, 100)
Finally
         g.Dispose()
End Try