c# - Export file using image saved to memory stream -

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i wanting save image file has been stored in memory stream.

i have saved asp.net chart memory stream.

stream1 = new memorystream(); chart_location_3.saveimage(stream1, chartimageformat.png);

and using following code export jpg. triggers save prompt , creates file image not open ("this not valid bitmap file, or format not supported") 

system.web.httpresponse response = system.web.httpcontext.current.response;  system.drawing.image img;  img = system.drawing.image.fromstream(stream1); response.clearcontent(); response.clear(); response.contenttype = "image/jpg"; response.addheader("content-disposition", "attachment; filename= exported.jpg;"); response.write(img); response.flush(); response.end();

changed response write to:

response.binarywrite(stream1.toarray());

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