Converting an Image file to a Bitmap and maintain aspect ratio?

[blakemckenna]

I'm creating a web image viewing app in C#. I have a section of code that will allow for upload of an Image file (*.gif, *.jpg, etc.). I take this image and make an ImageButton with a pixel size of 100x100. When I click on one of the ImageButtons, I need to be able to take the original Image File and reduce the size by 40% and still maintain it's aspect ratio...but I don't quite know how to do this. The below code is what I am working with but there are holes in the code.

        void UploadImpage()      //this routine works as it should
        {
            foreach (string filename in Directory.GetFiles(Server.MapPath("~/Data/")))
            {
                ImageButton imgButton = new ImageButton();
                FileInfo flInfo = new FileInfo(filename);

                imgButton.ImageUrl = "~/Data/" + flInfo.Name;
                imgButton.Width = Unit.Pixel(100);
                imgButton.Height = Unit.Pixel(100);
                imgButton.Style.Add("padding", "5px");
                imgButton.Click += new ImageClickEventHandler(imgButton_Click);
                Panel1.Controls.Add(imgButton);
            }
        }
        //
        //
        //
        void imgButton_Click(object sender,ImageClickEventArgs e)
        {
            ImageButton imgBtn = (ImageButton)sender;         //casting the selected ImageButton

            System.Drawing.Image img;

            //Here is where I'm lost
            img.Height = imgBtn.Height;

            Bitmap Img = new Bitmap(x, y);
            using (Graphics gr = Graphics.FromImage(Img))
            {
                gr.SmoothingMode = SmoothingMode.HighQuality;
                gr.InterpolationMode = InterpolationMode.HighQualityBicubic;
                gr.PixelOffsetMode = PixelOffsetMode.HighQuality;
                gr.DrawImage(p, new Rectangle(0, 0, x, y));
            }

            Response.Redirect("~/WebForm2.aspx?ImageURL=" + ((ImageButton)sender).ImageUrl);
        }

[si_the_geek]

Is this what you are after?

            img.Height = imgBtn.Height * 0.6;
            img.Width = img.Height;

[blakemckenna]

Si,

This is what I'm looking for and actually thought of this. However, the image button dimensions are 100px x 100px. If I use the ImageButton properties of Height and Width...do they hold the size value of the original image or what it was set to...in my case 100px?

Thanks,