NOT send data to home page

See more:

ASP.NET

MVC

.NET4.5

@if (Request.IsAuthenticated)
          {
              @User.Identity.Name
          @:<p style="color:red" >Welcome,@User.Identity.Name</p>
          @Html.ActionLink("خروج", "Logout") 
          }
          else{
         @Html.ActionLink("ورود", "login")   
          <br />
         @Html.ActionLink("ثبت نام", "GetUser")
          }

Request.IsAuthenticated is false and
@User.Identity.Name is =""


but i get data of login table and then login back to home peage but no get data for show User.Identity.Name why? :'(

please help me..