Asynchronous File Upload

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Web.Script.Services;
using System.Web.Services;
using MyControls.Web;

public partial class CrossPostBack_GallerySavePage : System.Web.UI.Page
{
    private MyControls.Web.AjaxUploadGalleryExtender AjaxUploadGalleryExtender1;

    protected void Page_Load(object sender, EventArgs e)
    {
        if (this.PreviousPage != null)
        {
            AjaxUploadGalleryExtender1 = (MyControls.Web.AjaxUploadGalleryExtender)this.PreviousPage.Master.FindControl("ContentPlaceHolder1").FindControl("AjaxUploadGalleryExtender1");
            Control postbackcontrol = MyControls.Web.Util.GetPostBackControl(this.Request, this.PreviousPage);
            string eventArgument = MyControls.Web.Util.GetPostBackArgment(this.Request);

            if (postbackcontrol == AjaxUploadGalleryExtender1)
            {
                switch (eventArgument[0])
                {
                    case 'P':
                        AjaxUploadFileEventArgs evt = new AjaxUploadFileEventArgs();
                        evt.FileIndex = int.Parse(eventArgument.Remove(0, 2));
                        evt.File = AjaxUploadGalleryExtender1.NewUplaodFile(Request.Files[AjaxUploadGalleryExtender1.UniqueID + "$file" + evt.FileIndex]);

                        AjaxUploadGalleryExtender1_Preview(AjaxUploadGalleryExtender1, evt);
                        break;
                    case 'S':
                        AjaxUploadGalleryExtender1_Submit(AjaxUploadGalleryExtender1, EventArgs.Empty);
                        break;

                }
            }
        }
    }
    [WebMethod(EnableSession = true), ScriptMethod]
    public static MyControls.Web.ProgressInfo GetProgressValue(string contextKey)
    {
        MyControls.Web.ProgressInfo info = MyControls.Web.AjaxUploadExtender.GetUploadInfo(contextKey);
        return info;
    }
    protected void AjaxUploadGalleryExtender1_Submit(object sender, EventArgs e)
    {
        int submitResult = 0;

        int galleryID = int.Parse(AjaxUploadGalleryExtender1.GetValue("gId"));
        string gallaryName = AjaxUploadGalleryExtender1.GetValue("name");

        string PictureName = "";
        try
        {
            string[] ImageNames = new string[AjaxUploadGalleryExtender1.Files.Count];
            for(int i = 0; i < AjaxUploadGalleryExtender1.Files.Count; i++)
            {
                MyControls.Web.AjaxUploadFile file = AjaxUploadGalleryExtender1.Files[i];
                string Title = file.GetValue("title");
                if(file.HasFile)
                    ImageNames[i] = SaveImage(file);
            }
            try
            {
                if (galleryID == -1)
                    galleryID = AddNewGallery(gallaryName,ImageNames);
                else
                    UpdateGallery(galleryID, gallaryName, ImageNames);
            }
            catch (Exception)
            {
                submitResult = 2;
            }

        }
        catch (Exception)
        {
            submitResult = 1;
        }

        Response.ClearContent();
        Response.ContentType = "text/plain";

        string responsevalue = string.Empty;
        responsevalue = string.Format("{{\"submitResult\":{0},\"galleryID\":{1}}}", submitResult, galleryID);
        Response.Write(responsevalue);
        Response.End();
    }

    private void UpdateGallery(int galleryID, string gallaryName, string[] ImageNames)
    {
        if (AjaxUploadGalleryExtender1.GetValue("except") == "data")
            throw new Exception();

        // call the database.

        for (int i = 0; i <= 100; i++)
        {
            MyControls.Web.ProgressInfo prog = AjaxUploadGalleryExtender1.ProgressInfo;
            prog.Message = string.Format("Updating Gallery no. {0}.. ", galleryID);
            prog.Value = i;

            System.Threading.Thread.Sleep(20);
        }
    }

    private int AddNewGallery(string gallaryName, string[] ImageNames)
    {
        if (AjaxUploadGalleryExtender1.GetValue("except") == "data")
            throw new Exception();

        // call the database.
        for (int i = 0; i <= 100; i++)
        {
            MyControls.Web.ProgressInfo prog = AjaxUploadGalleryExtender1.ProgressInfo;
            prog.Message = "Adding new Gallery.. ";
            prog.Value = i;

            System.Threading.Thread.Sleep(20);
        }


        Random random = new Random();
        int galleryID = random.Next(1, 100);

        return galleryID;
    }

    private string SaveImage(AjaxUploadFile file)
    {
        string filename = System.IO.Path.GetFileNameWithoutExtension(file.FileName);
        string extention = System.IO.Path.GetExtension(file.FileName);
        int index = 0;
        string savename = filename + extention;
        while (System.IO.File.Exists(Server.MapPath("~/UploadedImages/") + savename))
        {
            savename = string.Format("{0} ({1}){2}", filename, index, extention);
            index++;
        }
        file.SaveAs(Server.MapPath("~/UploadedImages/") + savename);

        return savename;
    }

    protected void AjaxUploadGalleryExtender1_Preview(object sender, MyControls.Web.AjaxUploadFileEventArgs e)
    {
        if (e.File.HasFile)
        {
            HttpPostedFile userPostedFile = e.File.PostedFile;

            ContentType = userPostedFile.ContentType;
            if (ContentType.StartsWith("image"))
            {
                int framewidth = 240;
                int frameheight = 180;

                System.Drawing.Bitmap original = new System.Drawing.Bitmap(e.File.FileContent);
                int width = original.Width;
                int height = original.Height;

                int previewWidth = framewidth;
                int previewHeight = frameheight;
                if (width > height)
                {
                    previewWidth = framewidth;
                    previewHeight = (previewWidth * height) / width;
                }
                else if (height > width)
                {
                    previewHeight = frameheight;
                    previewWidth = (previewHeight * width) / height;
                }

                System.Drawing.Bitmap preview = new System.Drawing.Bitmap(original, previewWidth, previewHeight);
                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                preview.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
                ms.Seek(0, System.IO.SeekOrigin.Begin);

                byte[] buffer = new byte[ms.Length];
                ms.Read(buffer, 0, (int)ms.Length);

                for (int i = 0; i <= 100; i++)
                {
                    MyControls.Web.ProgressInfo prog = AjaxUploadGalleryExtender1.ProgressInfo;
                    prog.Message = "Generating Perview .. ";
                    prog.Value = i;

                    System.Threading.Thread.Sleep(20);
                }

                Response.ContentType = userPostedFile.ContentType;
                Response.BinaryWrite(buffer);
                Response.End();
            }
        }
    }

}