Creating thread in web aplication results in session time out in IIS

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IIS7

C#

ASP.NET

IIS

C#4.0

Hi All,

In my asp.net application, iam using windows forms.dll to use some of the windows controls by creating a thread.This works fine in my system but is giving a session timeout when hosted on IIS.
Creating a thread gives me session time out on IIS.
How do i create threads that can work fine on IIS?

Below is the code where iam created the thread.

public string[] DisplayFileDialog()
        {
            string[] result = null;

            try
            {
                Thread objThread = new Thread(state =>{
                    result = FnOpenFileDialog();
                    // TODO: do something with the returned result
                });

                objThread.IsBackground = false;
                objThread.SetApartmentState(ApartmentState.STA);
                objThread.Start();
                objThread.Join();
                return result;

            }
            catch (Exception ex)
            {

              
                return result;
            }

     protected string[] FnOpenFileDialog()
        {
            IntPtr hdlr = GetForegroundWindow();

            WindowWrapper Mockwindow = new WindowWrapper(hdlr);

            OpenFileDialog fDialog = new OpenFileDialog();

            fDialog.Title = "Select Files";

            fDialog.Multiselect = true;
            fDialog.CheckFileExists = true;
            fDialog.CheckPathExists = true;

            System.Windows.Forms.DialogResult dr = fDialog.ShowDialog(Mockwindow);
            string[] filenames = fDialog.FileNames;
            return filenames;
        }

Thanks in advance.