Session got null (some time) when call to Web services

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In my web service I need to get one value from session variable. In the constructor of my web service I am getting this value like

C#

constructor()  // constructor of web service
{
  Person p = (Person)Session["xyz"];
  string name = p.Name;
  string Address = p.Address
}

my java script is like bellow

JavaScript

function CallWebservice()
{
MyWebservice.GetValueFromDb(onsucess,onfailure)
}

It works perfectly fine but some time i got the session as null, i have the session state in web.config which has default time out as 60 minutes.

but before 60 minutes(not all the time) the session is getting null, this things happens only when i am calling the webservice from java script

Posted 13-Feb-13 2:14am

nil1385

Updated 13-Feb-13 2:35am

joe_j

v3

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ZurdoDev 13-Feb-13 9:42am

Do you have [WebMethod(EnableSession = true)] on your webmethod?

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Tharaka MTR · Answer 1 · 2013-02-24T19:02:00

Im agreed with ryanb31 answer.
First you have to enable the session in your web service.
you can do that by adding following line to your web service
[WebMethod(EnableSession = true)]

http://msdn.microsoft.com/en-us/library/aa480509.aspx[^]
http://msdn.microsoft.com/en-us/library/system.web.services.webmethodattribute.enablesession(v=vs.90).aspx[^]

and avoid the session time out, you can create a non functional web service and keep calling to it using the javascript setInterval method.

HTML

[WebMethod(true)]
        public void KeepAlive()
        {
            //do nothing
        }