Rotate an image: where is the bug in my code?

[ceres83]

Yes, I know, the code is F#, but it's pretty similar to C#, so I hope you can find where is the problem!! I'm trying to rotate an image, but nothing happens. Can anyone tell me why?

openMenuItem.Click.Add(fun _ ->
let dialog = new OpenFileDialog()
if dialog.ShowDialog()= DialogResult.OK then


//Turn image
let mutable myBitmap = new Bitmap(dialog.FileName)
let mutable emptyBitmap = new Bitmap(myBitmap.Width, myBitmap.Height)
let mutable myBitmap1 = Graphics.FromImage(emptyBitmap)

myBitmap1.TranslateTransform((float32)(myBitmap.Width / 2), (float32)(myBitmap.Height / 2))
myBitmap1.RotateTransform((float32)30)
myBitmap1.TranslateTransform(-(float32)(myBitmap.Width / 2), -(float32)(myBitmap.Height / 2))

myBitmap1.DrawImage(myBitmap, 500,500)