Retain Session values after using FileUpload1.SaveAs

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C#

ASP.NET

File-Upload

I am experiencing loss of session variables after using .SaveAS method of FileUpload control.

I want to physically upload the actual file to the FTP server so I am using following code. But after using .SaveAs method, on second or third postback, session values are lost.

On page load, casting session (that was set from login page) as clsUser

protected void Page_Load(object sender, EventArgs e)
{
    if (Session["TheUser"] != null)
    {
        aUser = (clsUser)Session["TheUser"];
    }
}

on button click

protected void Button1_Click(object sender, EventArgs e)
{
    if (FileUpload1.HasFile)//continue only if the file control has the file
    {
        if (Get_and_Show_FileInformation())//if the file information was retrieved
        {
            //continue with the execution
        }
        else
        {
            //error message displyed
        }
    }
}

This function is used to get, show and upload file to FTP serer. Here I am using

.SaveAs

method that causes the loss of session values.

protected bool Get_and_Show_FileInformation()
{
   if (FileUpload1.HasFile)
    {
        string fName = FileUpload1.PostedFile.FileName;
        string extension = Path.GetExtension(fName);
        string FileName = fName.Substring(0, fName.Length - extension.Length);
        string dir = uname;
        string appPath = Server.MapPath("Uploads/") + dir;
        FileInfo MyFileInfo = new FileInfo(appPath);
        DirectoryInfo newDirectoryInfo = new DirectoryInfo(appPath);
        if (!Directory.Exists(appPath))//FTP_Upload first time, create a directory 
        {
            try
            {
                FileUpload1.SaveAs(Server.MapPath("~/Uploads/" + dir + "/" + FileName));  // ERROR here, call to this .SaveAs method causes loss of session values (Session["TheUser"])
                Image2.ImageUrl = "~/Uploads/" + dir + "/" + FileName;
                return true;
            }
            catch (Exception ex)
            {
                lbl_Err.Text = "<br/>Error: Error creating and saving into your space!(Error Code:XF05)";
                return false;
            }
        }
        else
        {
            //same code but don't create the directory
        }
    }
}

I am not sure what is the reason for this, any ideas, work around?