How to make thumbnail of an image and fix this in center position of div using asp.net and c#

First you have to create a page of CreateThumbnail.aspx and paste this below code :-

    protected void Page_Load(object sender, EventArgs e)
    {
        string Image = Request.QueryString["Image"];

        if (Image == null)
        {
            this.ErrorResult();
            return;
        }

        string sSize = Request["Size"];
        int Size = 120;
        if (sSize != null)
            Size = Int32.Parse(sSize);

        string Path = Server.MapPath(Request.ApplicationPath) + "\\" + Image;
        Bitmap bmp = CreateThumbnail(Path, Size, Size);

        if (bmp == null)
        {
            this.ErrorResult();
            return;
        }

        string OutputFilename = null;
        OutputFilename = Request.QueryString["OutputFilename"];

        if (OutputFilename != null)
        {
            if (this.User.Identity.Name == "")
            {
                // *** Custom error display here
                bmp.Dispose();
                this.ErrorResult();
            }

            try
            {
                bmp.Save(OutputFilename);
            }

            catch (Exception ex)
            {
                bmp.Dispose();
                this.ErrorResult();
                return;
            }
        }

        // Put user code to initialize the page here
        Response.ContentType = "image/jpeg";
        bmp.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
        bmp.Dispose();
    }

    private void ErrorResult()
    {
        Response.Clear();
        Response.StatusCode = 404;
        Response.End();
    }

    public static Bitmap CreateThumbnail(string lcFilename, int lnWidth, int lnHeight)
    {
        System.Drawing.Bitmap bmpOut = null;
        try
        {
            Bitmap loBMP = new Bitmap(lcFilename);
            ImageFormat loFormat = loBMP.RawFormat;

            decimal lnRatio;
            int lnNewWidth = 0;
            int lnNewHeight = 0;

            //*** If the image is smaller than a thumbnail just return it
            if (loBMP.Width < lnWidth && loBMP.Height < lnHeight)
                return loBMP;

            if (loBMP.Width > loBMP.Height)
            {
                lnRatio = (decimal)lnWidth / loBMP.Width;
                lnNewWidth = lnWidth;
                decimal lnTemp = loBMP.Height * lnRatio;
                lnNewHeight = (int)lnTemp;
            }
            else
            {
                lnRatio = (decimal)lnHeight / loBMP.Height;
                lnNewHeight = lnHeight;
                decimal lnTemp = loBMP.Width * lnRatio;
                lnNewWidth = (int)lnTemp;
            }

            // System.Drawing.Image imgOut = loBMP.GetThumbnailImage(lnNewWidth,lnNewHeight, null,IntPtr.Zero);

            // *** This code creates cleaner (though bigger) thumbnails and properly
            // *** and handles GIF files better by generating a white background for
            // *** transparent images (as opposed to black)
            bmpOut = new Bitmap(lnNewWidth, lnNewHeight);
            Graphics g = Graphics.FromImage(bmpOut);
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
            g.FillRectangle(Brushes.White, 0, 0, lnNewWidth, lnNewHeight);
            g.DrawImage(loBMP, 0, 0, lnNewWidth, lnNewHeight);

            loBMP.Dispose();
        }
        catch
        {
            return null;
        }
        return bmpOut;
    }

How to call this page on demo page :-

Add this script to set image in center position of div :-