How to resize an Image at run-time in C# asp.Net?

In this article you will learn about how to resize an Image at run-time using C# asp.Net.Resize an image with good quality, and having less weight of an image so that webpages will load it faster.

should reference the following namespases.

using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;

#region Events 
 protected void ResizeButton_click(object sender,EventArgs e)
    {
        string path = Server.MapPath("~/Images");
        ResizePhoto(path);
    }
    #endregion
  public static void ResizePhoto(string imgpath)
    {
        //if you want dynamically to change images set path insead of 3904.jpg
        using (var image = System.Drawing.Image.FromFile(string.Concat(imgpath, "/3904.jpg")))
        using (var newImage = ScaleImage(image, 350, 450))
        {
            // dynamically change the name of new size image by any customized name (e.g:datetime )
            newImage.Save(string.Concat(imgpath, "/test.jpg"), ImageFormat.Png);
        }
    }

    public static System.Drawing.Image ScaleImage(System.Drawing.Image image, int maxWidth, int maxHeight)
    {
        var ratioX = (double)maxWidth / image.Width;
        var ratioY = (double)maxHeight / image.Height;
        var ratio = Math.Min(ratioX, ratioY);

        var newWidth = (int)(image.Width * ratio);
        var newHeight = (int)(image.Height * ratio);

        var newImage = new Bitmap(newWidth, newHeight);

        using (var graphics = Graphics.FromImage(newImage))
            graphics.DrawImage(image, 0, 0, newWidth, newHeight);

        return newImage;
    }