Camera Picture Update

I am loading a picture from a logitech camera into a picturebox, however when I try to update the picture, I cannot use the same filename because it is being used by my program. Is there a way to free the picture from my program?

For instance:

Code:

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        Dim bmp as bitmap
        Dim img as image

        AxVideoPortal1.PictureToFile(0, 24, "C:\tmp1.bmp", "Gray Scaled Camera") '  This just traps the image from the camera to a bitmap
        bmp = New Bitmap("c:\documents and settings\mark\desktop\picture 1.bmp")
        PictureBox1.Image = bmp
        img = PictureBox1.Image(bmp)
        grayscale(img) 'routine to get grayscale and change picture box to the grayscaled version

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I got it to work, so if anyone needs to do it, here is the code:
The problem was img was never being disposed.

Code:

---

     
Dim err As ErrObject
        PictureBox1.Image = Nothing
        Try
            img.Dispose()
        Catch
        End Try
        FileSystem.Kill("c:\tmp.bmp")
        AxVideoPortal1.PictureToFile(0, 24, "C:\tmp.bmp", "Gray Scaled Camera")
        img = img.FromFile("c:\tmp.bmp")
        grayscale(img)
        PictureBox1.Image = img

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