How to save picturebox's paint function drawings only on bitmap in c#?

[thippu]

1. I'm drawing shapes on the PictureBox control using Paint event of it.
2. May I know how to save drawn shapes only on a bitmap without the picture box image(current).
3. I don't want to save the PictureBox image.
4. I have created the bitmap from the image(White background image) for saving a drawing on it.
5. I want to save it on created bitmap image(4).

Image WhiteBackGroundImage=Image.FromFile("path");//fetching white back ground image.
Bitmap pic=new Bitmap(WhiteBackGroundImage);//creating bitmap
pictureBoxImage.DrawToBitmap(pic,pictureBoxImage.ClientRectangle);
pic.Save("path", ImageFormat.Png);

thippu

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