Saving image in paint app c#

I am working on a simple paint app. I got everything working except save. I am doing all the paint operations inside a panel. I need to save it as an image. How to do thi开发者_运维知识库s?

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Use this code

Bitmap bmp = new Bitmap(panel1.Width, panel1.Height);//to create bmp of same size as panel
Rectangle rect=new Rectangle(0,0,panel1.Width,panel1.Height); //to set bounds to image
panel1.DrawToBitmap(bmp,rect);      // drawing panel1 imgae into bmp of bounds of rect
bmp.Save("C:\\a.png", System.Drawing.Imaging.ImageFormat.Png); //save location and type

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Here is a great example of paint app: 1) WPF 2) WinForms

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Something like this:

public void SaveAs()
    {
        SaveFileDialog diag = new SaveFileDialog();
        DialogResult dr = diag.ShowDialog();

        if (dr.Equals(DialogResult.OK))
        {

            string _filename = diag.FileName;

            // filename not specified. Use FileName = ...
            if (_filename == null || _filename.Length == 0)
                throw new Exception("Unspecified file name");

            // cannot override RO file
            if (File.Exists(_filename)
                && (File.GetAttributes(_filename)
                & FileAttributes.ReadOnly) != 0)
                throw new Exception("File exists and is read-only!");

            // check supported image formats
            ImageFormat format = FormatFromExtension(_filename);
            if (format == null)
                throw new Exception("Unsupported image format");

            // JPG images get special treatement
            if (format.Equals(ImageFormat.Jpeg))
            {
                EncoderParameters oParams = new EncoderParameters(1);
                oParams.Param[0] = new EncoderParameter(
                    System.Drawing.Imaging.Encoder.Quality, 100L);
                ImageCodecInfo oCodecInfo = GetEncoderInfo("image/jpeg");
                yourImage.Save(_filename, oCodecInfo, oParams);
            }
            else
                yourImage.Save(_filename, format);

        }
    }

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If you're using wpf you can take alook at RenderTargetBitmap. It can render any visual into a bitmap that you can then save using @danyogiaxs awnser

-edit-

I also found this SO post for doing the same on winforms