[2005] Problem with BitBlt from Bitmap to Bitmap

[pax]

Hi.

Can someone tell me why this doesn't work?
I would expect the end result to be all red, but nothing happens.
If I remove the source bitmap and graphics object and just use "hdcSrc=GetDC(0)" then I get a screenshot, so I know the BitBlt function works.
It appears that the BitBlt function can't copy from one memory image to another.

So, can anyone answer this:
Are there any problems BitBlt'ing two memory images? Or does it have to be real physical devicecontexts?

Dim bmpDst, bmpSrc As Bitmap
        Dim grpDst, grpSrc As Graphics
        Dim hdcDst, hdcSrc As IntPtr
 
        bmpDst = New Bitmap(Panel1.ClientRectangle.Width, Panel1.ClientRectangle.Height)
        bmpSrc = New Bitmap(Panel1.ClientRectangle.Width, Panel1.ClientRectangle.Height)
 
        grpDst = Graphics.FromImage(bmpDst)
        grpSrc = Graphics.FromImage(bmpSrc)
 
        grpDst.Clear(Color.Black)
        grpSrc.Clear(Color.Red)
        grpSrc.Flush()
 
        hdcDst = grpDst.GetHdc
        hdcSrc = grpSrc.GetHdc
 
        Win32.Declarations.BitBlt(hdcDst, 0, 0, bmpDst.Width, bmpDst.Height, hdcSrc, 0, 0, Win32.Constants.BitBltConstants.SRCCOPY)
 
        grpSrc.ReleaseHdc(hdcSrc)
        grpDst.ReleaseHdc(hdcDst)
 
        grpSrc.Dispose()
        grpDst.Dispose()
 
        e.Graphics.DrawImage(bmpDst, 0, 0)
 
        bmpDst.Dispose()
        bmpSrc.Dispose()

Thanks