I have this code to resize an image but the image doesn't look so good:

public Bitmap ProportionallyResizeBitmap(Bitmap src, int maxWidth, int maxHeight)
{

    // original dimensions
    int w = src.Width;
    int h = src.Height;
    // Longest and shortest dimension
    int longestDimension = (w > h) ? w : h;
    int shortestDimension = (w < h) ? w : h;
    // propotionality
    float factor = ((float)longestDimension) / shortestDimension;
    // default width is greater than height
    double newWidth = maxWidth;
    double newHeight = maxWidth / factor;
    // if height greater than width recalculate
    if (w < h)
    {
        newWidth = maxHeight / factor;
        newHeight = maxHeight;
    }
    // Create new Bitmap at new dimensions
    Bitmap result = new Bitmap((int)newWidth, (int)newHeight);
    using (Graphics g = Graphics.FromImage((System.Drawing.Image)result))
        g.DrawImage(src, 0, 0, (int)newWidth, (int)newHeight);
    return result;
}