convert graphic to Bitmap [closed]

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I am creating a Graphics object to draw on the original image and I want save the modified image as a new image.The Image on the form as well as the drawing

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 //load bitmap from file
 Image bmp = Image.FromFile();

Graphics g = Graphics.FromImage(bmp);

//do drawing here with g.

bmp.Save();

g.Dispose()

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    Bitmap newBitmap = new Bitmap(originalBitmap);
    using (Graphics myGraphics = Graphics.FromImage(newBitmap))
    {
        // draw here on myGraphics
    }
    // newBitmap - modified image

Alternatively with Load & Save:

    Bitmap myBitmap = new Bitmap("fileName.bmp");
    using (Graphics myGraphics = Graphics.FromImage(myBitmap))
    {
        // draw here on myGraphics
    }
    myBitmap.Save("newFileName.bmp");