Session values returns null always

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C#

ASP.NET

Hi,

In my web application, i need to show 'Progress Bar' of uploading status. I got the source from one of the CP member's post.Link

Problem is,
I'm using master page and Content page for my whole application. While i try to upload from an simple aspx page it works fine. But while i tried using Master and Content its not works well.

My code structure is,

One of my content page contains <Frame> for loading a simple aspx page
like,

<iframe id="uploadFrame" frameborder="0" scrolling="yes" src="UploadEngine.aspx">  </iframe>

where "UploadEngine.aspx" Contains Code to Save a Particular File on Server.


Here we have an Class file named "UploadDetail.cs" contains four different variables used to maintain in Session for obtaining current upload status from "UploadEngine.aspx"

Hence while i click upload button from a Content page which contains <Iframe>. It just calls the "UploadEngine.aspx" and starts upload the files into my server's specified folder, but i can't getting the session variables updated for showing progress status. Its always remains null.

Hope you understand !
Please help me out...



My Upload.aspx

//Start upload process

function onUploadClick() {
if (fileUpload.value.length > 0) {
    
    if (true) {
        //Update the message, for respective Div through different functions 
        updateMessage(MessageStatus.Information, 'Initializing upload ...', '', '0 of 0 Bytes');
        //Submit the form containing the fileupload control
        form.submit(); //here i'm submitting "UploadEngine.aspx.cs" to start Upload
        
        Sys.UI.DomElement.addCssClass($get('dvUploader'), 'StartUpload');
        //Initialize progressbar
        setProgress(0);
       
        startProgress();
        intervalID = window.setInterval(function() {
        PageMethods.GetUploadStatus(function(result) {
            if (result) {
                setProgress(result.percentComplete);
                //Upadte the message every 500 milisecond
                updateMessage(MessageStatus.Information, result.message, result.fileName, result.downloadBytes);
                if (result == 100) {
                    //clear the interval
                    window.clearInterval(intervalID);
                    clearTimeout(subintervalID);
                }
            }
        });
        }, 500);
    }
    else
        onComplete(MessageStatus.Error, "File name '" + filename + "' already exists in the list.", '', '0 of 0 Bytes');
}
else
    onComplete(MessageStatus.Warning, 'You need to select a file.', '', '0 of 0 Bytes');
}

My Upload.aspx.cs

protected void Page_Load(object sender, EventArgs e)
   {
       if (!this.IsPostBack)
       {
           //Reserve a spot in Session for the UploadDetail object
           this.Session["UploadDetail"] = new UploadDetail { IsReady = false };

       }
   }



  [System.Web.Services.WebMethod]
  [System.Web.Script.Services.ScriptMethod]
  public static object GetUploadStatus()
  {
      //Get the length of the file on disk and divide that by the length of the stream
      UploadDetail info = (UploadDetail)HttpContext.Current.Session["UploadDetail"];
      if (info != null && info.IsReady)
      {
          long soFar = info.UploadedLength;
          long total = info.ContentLength;
          int percentComplete = (int)Math.Ceiling((double)soFar / (double)total * 100);
          string message = "Uploading...";
          string fileName = string.Format("{0}", info.FileName);
          string downloadBytes = string.Format("{0} of {1} Bytes", soFar, total);
          return new
          {
              percentComplete = percentComplete,
              message = message,
              fileName = fileName,
              downloadBytes = downloadBytes
          };
      }
      //Not ready yet
      return null;
  }

UploadDetail.cs

public class UploadDetail
{
    public bool IsReady { get; set; }
    public long  ContentLength { get; set; }
    public long  UploadedLength { get; set; }
    public long  TotalUploadedLength { get; set; }
    public string FileName { get; set; }
}

UploadEngine.aspx.cs

protected void Page_Load(object sender, EventArgs e)
    {
        if (this.IsPostBack)
        {
            UploadDetail Upload = (UploadDetail)this.Session["UploadDetail"];
            //Let the webservie know that we are not yet ready
            Upload.IsReady = false;

            HttpFileCollection hfc = Request.Files;

            string fileName = "";
            int ContentTotalLen = 0;
            for (int k = 0; k < hfc.Count; k++)
            {
                HttpPostedFile hhpf = hfc[k];
                ContentTotalLen += hhpf.ContentLength;
            }

            if (ContentTotalLen > 0)
            {
                //build the local path where upload all the files
                string path = @"E:\FTPFILES\";

                //Let the polling process know that we are done initializing ...
                Upload.IsReady = true;
                Upload.TotalUploadedLength = 0;

                for (int i = 0; i < hfc.Count; i++)
                {
                    HttpPostedFile hpf = hfc[i];
                    fileName = System.IO.Path.GetFileName(hpf.FileName);

                    //Build the strucutre and stuff it into session
                    Upload.ContentLength = hfc[i].ContentLength;

                    Upload.UploadedLength = 0;

                    if (fileName != "")
                    {
                        Upload.FileName = fileName;

                        //set the buffer size to something larger.
                        //the smaller the buffer the longer it will take to download, 
                        //but the more precise your progress bar will be.
                        int bufferSize = 1;
                        byte[] buffer = new byte[bufferSize];

                        //Writing the byte to disk
                        using (FileStream fs = new FileStream(Path.Combine(path, fileName), FileMode.Create))
                        {
                            //As long was we haven't written everything...
                            while (Upload.UploadedLength < Upload.ContentLength)
                            {

                                //Fill the buffer from the input stream
                                int bytes = hfc[i].InputStream.Read(buffer, 0, bufferSize);
                                //Writing the bytes to the file stream
                                fs.Write(buffer, 0, bytes);
                                //Update the number the webservice is polling on to the session
                                Upload.UploadedLength += bytes;

                                //for Complete function
                                Upload.TotalUploadedLength += bytes;
                            }
                        }

                    }

                }


                //Call parent page know we have processed the uplaod
                const string js = "window.parent.onComplete(1,'File uploaded successfully.','{0}','{1} of {2} Bytes');";
                ScriptManager.RegisterStartupScript(this, typeof(UploadEngine), "progress", string.Format(js, fileName, Upload.TotalUploadedLength, ContentTotalLen), true);

            }
            else
            {
                //Call parent page know we have processed the uplaod
                const string js = "window.parent.onComplete(4, 'There was a problem with the file.','','0 of 0 Bytes');";
                ScriptManager.RegisterStartupScript(this, typeof(UploadEngine), "progress", js, true);
            }

        }
    
    }