c# - Getting a null return from a GetUserManager call when using AspNet.Identity -

i have attempted go through few examples of utilizing microsoft.aspnet.identity , microsoft.asp.identity.owin within webforms. have been able create database tables within current database (i choose keep both aspnet tables user, stores , roles manager in same database application) , have model, controller, view , app_start folders in place needed files.

the line having issues in code behind file forgetpassword in account folder: var manager = context.getowincontext().getusermanager();

here how have files set up: app_start: identityconfig.cs

using system; using system.security.claims; using system.threading.tasks; using microsoft.aspnet.identity; using microsoft.aspnet.identity.entityframework; using microsoft.aspnet.identity.owin; using microsoft.owin; using microsoft.owin.security; using fhsf_4_dev.models;  namespace fhsf_4_dev {     public class emailservice : iidentitymessageservice     {         public task sendasync(identitymessage message)         {             // plug in email service here send email.             return task.fromresult(0);         }     }      public class smsservice : iidentitymessageservice     {         public task sendasync(identitymessage message)         {             // plug in sms service here send text message.             return task.fromresult(0);         }     }      // configure application user manager used in application. usermanager defined in asp.net identity , used application.     public class applicationusermanager : usermanager<applicationuser>     {         public applicationusermanager(iuserstore<applicationuser> store)             : base(store)         {         }          public static applicationusermanager create(identityfactoryoptions<applicationusermanager> options, iowincontext context)         {             var manager = new applicationusermanager(new userstore<applicationuser>(context.get<applicationdbcontext>()));             // configure validation logic usernames             manager.uservalidator = new uservalidator<applicationuser>(manager)             {                 allowonlyalphanumericusernames = false,                 requireuniqueemail = true             };              // configure validation logic passwords             manager.passwordvalidator = new passwordvalidator             {                 requiredlength = 6,                 requirenonletterordigit = true,                 requiredigit = true,                 requirelowercase = true,                 requireuppercase = true,             };              // register 2 factor authentication providers. application uses phone , emails step of receiving code verifying user             // can write own provider , plug in here.             manager.registertwofactorprovider("phone code", new phonenumbertokenprovider<applicationuser>             {                 messageformat = "your security code {0}"             });             manager.registertwofactorprovider("email code", new emailtokenprovider<applicationuser>             {                 subject = "security code",                 bodyformat = "your security code {0}"             });              // configure user lockout defaults             manager.userlockoutenabledbydefault = true;             manager.defaultaccountlockouttimespan = timespan.fromminutes(5);             manager.maxfailedaccessattemptsbeforelockout = 5;              manager.emailservice = new emailservice();             manager.smsservice = new smsservice();             var dataprotectionprovider = options.dataprotectionprovider;             if (dataprotectionprovider != null)             {                 manager.usertokenprovider = new dataprotectortokenprovider<applicationuser>(dataprotectionprovider.create("asp.net identity"));             }             return manager;         }     }      public class applicationsigninmanager : signinmanager<applicationuser, string>     {         public applicationsigninmanager(applicationusermanager usermanager, iauthenticationmanager authenticationmanager) :             base(usermanager, authenticationmanager) { }          public override task<claimsidentity> createuseridentityasync(applicationuser user)         {             return user.generateuseridentityasync((applicationusermanager)usermanager);         }          public static applicationsigninmanager create(identityfactoryoptions<applicationsigninmanager> options, iowincontext context)         {             return new applicationsigninmanager(context.getusermanager<applicationusermanager>(), context.authentication);         }     } } 

app_start: startup.auth.cs

using system; using microsoft.aspnet.identity; using microsoft.aspnet.identity.entityframework; using microsoft.aspnet.identity.owin; using microsoft.owin; using microsoft.owin.security.cookies; using microsoft.owin.security.dataprotection; using microsoft.owin.security.google; using owin; using fhsf_4_dev.models;  namespace fhsf_4_dev {     public partial class app_start_startup {          // more information on configuring authentication, please visit https://go.microsoft.com/fwlink/?linkid=301883         public void configureauth(iappbuilder app)         {             // configure db context, user manager , signin manager use single instance per request             app.createperowincontext(applicationdbcontext.create);             app.createperowincontext<applicationusermanager>(applicationusermanager.create);             app.createperowincontext<applicationsigninmanager>(applicationsigninmanager.create);              // enable application use cookie store information signed in user             // , use cookie temporarily store information user logging in third party login provider             // configure sign in cookie             app.usecookieauthentication(new cookieauthenticationoptions             {                 authenticationtype = defaultauthenticationtypes.applicationcookie,                 loginpath = new pathstring("~/default.aspx"),                 provider = new cookieauthenticationprovider                 {                     onvalidateidentity = securitystampvalidator.onvalidateidentity<applicationusermanager, applicationuser>(                         validateinterval: timespan.fromminutes(30),                         regenerateidentity: (manager, user) => user.generateuseridentityasync(manager))                 }             });             // use cookie temporarily store information user logging in third party login provider             app.useexternalsignincookie(defaultauthenticationtypes.externalcookie);              // enables application temporarily store user information when verifying second factor in two-factor authentication process.             app.usetwofactorsignincookie(defaultauthenticationtypes.twofactorcookie, timespan.fromminutes(5));              // enables application remember second login verification factor such phone or email.             // once check option, second step of verification during login process remembered on device logged in from.             // similar rememberme option when log in.             app.usetwofactorrememberbrowsercookie(defaultauthenticationtypes.twofactorrememberbrowsercookie);              // uncomment following lines enable logging in third party login providers             //app.usemicrosoftaccountauthentication(             //    clientid: "",             //    clientsecret: "");              //app.usetwitterauthentication(             //   consumerkey: "",             //   consumersecret: "");              //app.usefacebookauthentication(             //   appid: "",             //   appsecret: "");              //app.usegoogleauthentication(new googleoauth2authenticationoptions()             //{             //    clientid = "",             //    clientsecret = ""             //});         }     } } 

account: forgotpassword.aspx

<%@ page title="forgot password" language="c#" masterpagefile="~/site.master" autoeventwireup="true" codebehind="forgotpassword.aspx.cs" inherits="fhsf_4_dev.account.forgotpassword" async="true" %>  <asp:content runat="server" id="bodycontent" contentplaceholderid="maincontent">     <div style="width: 20%; text-align: center; color: white; margin-left: 40%; margin-right: 40%;">         <div class="row">             <div class="col-md-8">                 <asp:placeholder id="loginform" runat="server">                     <div class="form-horizontal">                         <h2>forgot password?</h2>                         <hr />                         <asp:placeholder runat="server" id="errormessage" visible="false">                             <p class="text-danger">                                 <asp:literal runat="server" id="failuretext" />                             </p>                         </asp:placeholder>                         <div class="form-group" style="align-content:center">                             <asp:label runat="server" associatedcontrolid="email" cssclass="col-md-2 control-label">email</asp:label>                             <div class="col-md-10" style="margin-left:28%; margin-right:28%;">                                 <asp:textbox runat="server" id="email" cssclass="form-control" textmode="email" />                                 <asp:requiredfieldvalidator runat="server" controltovalidate="email"                                     cssclass="text-danger" errormessage="the email field required." />                             </div>                         </div>                         <div class="form-group">                             <div class="col-md-offset-2 col-md-10">                                 <asp:button runat="server" onclick="forgot" text="email link" cssclass="btn btn-default" />                             </div>                         </div>                     </div>                 </asp:placeholder>                 <asp:placeholder runat="server" id="displayemail" visible="false">                     <p class="text-info">                         please check email reset password.                     </p>                 </asp:placeholder>             </div>         </div>     </div> </asp:content> 

account: forgotpassword.aspx.cs

using system; using system.web; using system.web.ui; using microsoft.aspnet.identity; using microsoft.aspnet.identity.owin; using owin; using fhsf_4_dev.models; using sendgrid; using system.net; using system.configuration; using system.diagnostics; using fhsf_4_dev;  namespace fhsf_4_dev.account {     public partial class forgotpassword : page     {         protected void page_load(object sender, eventargs e)         {         }          protected void forgot(object sender, eventargs e)         {             if (isvalid)             {                 // validate user's email address                 var manager = context.getowincontext().getusermanager<applicationusermanager>();                 applicationuser user = manager.findbyname(email.text);                 if (user == null || !manager.isemailconfirmed(user.id))                 {                     failuretext.text = "the user either not exist or not confirmed.";                     errormessage.visible = true;                     return;                 }                 // more information on how enable account confirmation , password reset please visit https://go.microsoft.com/fwlink/?linkid=320771                 // send email code , redirect reset password page                 string code = manager.generatepasswordresettoken(user.id);                 string callbackurl = identityhelper.getresetpasswordredirecturl(code, request);                 manager.sendemail(user.id, "reset password", "please reset password clicking <a href=\"" + callbackurl + "\">here</a>.");                 loginform.visible = false;                 displayemail.visible = true;             }         }     } } 

it seems have things set needed, return var manager = context.getowincontext().getusermanager(); line in forgotpassword.aspx.cs null, though have user set in aspnetuser table.

any on leading me why getting null value , how can correct reference appreciated!