unable to modify session values in Thread

Hi,

I have page1.aspx, in page load I have function which will be called in Thread as

if (isEmail == 1)
           {
               //objmyClass.deliveryType = "email";
               Thread cwpThread = new Thread(new ParameterizedThreadStart(ProcessMyList));
               abc.Start("email");

           }
           if (isFax == 1)
           {
               //objmyClass.deliveryType = "fax";
               Thread abc = new Thread(new ParameterizedThreadStart(ProcessMyList));
               abc.Start("fax");
           }

In the above code ProcessMyList will be called in thread & in this function I am assigning session values as

Session["EmailFileIds"] = "1234";
           Session["FaxFileIds"] = "4321";

. But when I navigate to another page, I am not able to read these session values.

help me in this regard.

Thanks