emgu cv save image to file in vb - vb.net

Question

I have copied a webcam image capture tutorial from the web. It works OK. I want to watch a changing scene and save a captured image to disk when I push a button on the form. The button push is detected, but I am unable to save an image. Here is the main code. I have tried two save methods but neither works. What am I missing?
Sub ProcessFrameAndUpdateGUI(sender As Object, arg As EventArgs)
imgOriginal = capWebcam.QueryFrame() 'get the next frame from the webcam
If (imgOriginal Is Nothing) Then 'if we didn't get a frame
Return
End If
If btnStackPressed = True Then 'is button pressed?
btnStackPressed = False 'clear the button
imgOriginal = capWebcam.QueryFrame() 'get the next frame from the webcam
End If
ibOriginal.Image = imgOriginal 'display the current image in the imagebox
cvSaveImage("C:\imagesaved.bmp", imgOriginal) 'save current image as bmp
imgOriginal.Save("C:/MyPic.jpg") 'save current image as jpg
End Sub

Answer 1

This is sort of an answer. I don't understand the underlying facts. I saw a post on another blog that said the failure to save might be due to a Windows security issue and recommended saving to another disk. This closes the issue for me.
imgOriginal.Save("C:\imgsaved.jpg") 'This doesn't work.
imgOriginal.Save("C:\Photo_temp\imgsaved.jpg") 'This works.
imgOriginal.Save("G:\Photo_temp\imgsaved.jpg") 'This works.
imgOriginal.Save("G:\imgsaved.jpg") 'This works.