copy contents of CDC to gdi + graphics object

Question

Hi all
Please help me for this---

In my project all drawing operations are done by using CDC object.
CDC stretchBlt , BitBlt like functions are used.
I want to copy contents of this on GDI+ Graphic object created using Bitmap.
I tried following code, but its not woking
Can anyone help me.......????????

sDC = GetDC();

Bitmap* scrollBitmap = new Bitmap(680,768,PixelFormat32bppPARGB);
    
    Graphics gr(scrollBitmap);
    HDC hdc = gr.GetHDC();
    
CDC *gDC = CDC::FromHandle(hdc);

sDC is  original Dc on which all drawing is done.

i have created new CDC gDC- which is created by using Graphics object

I tried to use dtatement gDC->StretchBlt(destination gDC,-,-Source is SDC);

but this is not working, nothing on BITMAP....

Please help me what can i do for this