asp.net mvc - MVC RedirectToAction calls Session_Start() in global.asax -

i calling redirecttoaction method call action method controller clears session data debugged in global.asax , found out when ever call redirecttoaction calls session_start() method. don't know how session start called. here web config code form , session tag

for session tag

<sessionstate mode="inproc" customprovider="defaultsessionprovider">   <providers>     <add name="defaultsessionprovider" type="system.web.providers.defaultsessionstateprovider, system.web.providers, version=1.0.0.0, culture=neutral, publickeytoken=31bf3856ad364e35" connectionstringname="defaultconnection" />   </providers> </sessionstate> 

and form tag

<authentication mode="forms">   <forms loginurl="~/controllername/actionname" timeout="2880" /> </authentication> 

this "~/controllername/actionname" same method wher calling "redirectoaction"

just info trying if found cookies user redirected home page login page directly

both action methods in different controller , in different areas. here code uses "redirectoaction" method

public class logincontroller : controller{ public actionresult index() {     if (request.cookies["username"] != null && request.cookies["password"] != null)     {         fillloginsession();//fills session user data ex. session["user_id"] = 1;         return redirecttoaction("index", "home", new { area = "home" });     } }} 

and here action method in controller redirecting.

public class homecontroller : controller{ public actionresult index() {     return view(); }} 

ok got solution problem. calling this

response.cookies.add(new httpcookie("asp.net_sessionid", "")); 

before initializing session method. in iis key "asp.net_sessionid" used store session in cookies. cleared reinitialize when ever redirect new page.