Copy string drawn by using CDC object 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