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 :-