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Session access in web service locks the multithreading

I have a problem - if I access the session in Web Service, as soon as I
store
anything in it, requests are no longer running in parallel - instead,
they are
queued and executed sequentially. Here is an example (ASP.NET 2.0, VS
2005).

Web service method (web service is a regular asmx):

[WebMethod(Enabl eSession = true)]
public String DoNothing()
{
Thread.Sleep(10 000);
// HttpContext.Cur rent.Session["initvar"] = 123;
return HttpContext.Cur rent.Session.Se ssionID;
}

Client (console application with web reference):

class Program
{
static void Main(string[] args)
{
Program pr1 = new Program();
Program pr2 = new Program();
System.Net.Cook ieContainer cc = new
System.Net.Cook ieContainer();
localhost.CellS earchService svc1 = new
localhost.CellS earchService();
svc1.CookieCont ainer = cc;
Console.WriteLi ne(svc1.DoNothi ng());
localhost.CellS earchService svc2 = new
localhost.CellS earchService();
svc2.CookieCont ainer = cc;
svc1.DoNothingC ompleted += new
WebSvcTester.lo calhost.DoNothi ngCompletedEven tHandler(pr1.sv c_DoNothingComp leted);
svc2.DoNothingC ompleted += new
WebSvcTester.lo calhost.DoNothi ngCompletedEven tHandler(pr2.sv c_DoNothingComp leted);
svc1.DoNothingA sync();
svc2.DoNothingA sync();
Console.In.Read Line();
}

void svc_DoNothingCo mpleted(object sender,
WebSvcTester.lo calhost.DoNothi ngCompletedEven tArgs e)
{
Console.WriteLi ne(e.Result);
}
}

See that first call is sync, and next 2 are async. If in web service
method I have this line commented out:

// HttpContext.Cur rent.Session["initvar"] = 123;

then async calls are processed in parallel, and for all 3 calls I get
different session ids. But if I uncomment it, async calls are executed
sequentially, and all 3 session ids are the same.

Looks like as soon as something is stored in a session (thus, session
is actually used), something in .NET framework prevents requests from
multithreading. Can I make it not so intelligent and leave this
decision to me? I will take care of threads synchronization myself.

Jul 12 '06 #1
0 1136

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