Ever want to create a list of logged in users for a site, maybe for the Admin view or all users?

Here's how:

In your AccountController add a simple class:

public class LoggedInUsers
{
  public string   MemberName   { get; set; }
  public DateTime LoggedInTime { get; set; }

  public LoggedInUsers( string memberName, DateTime loggedInTime )
  {
    MemberName   = memberName;
    LoggedInTime = loggedInTime;
  }
}

Then in your AccountController add a:
 
public static List<LoggedInUsers> OnlineUsers;

Then in your AccountController's [HtmlPost] Login(...) method add this line for authenticated users:
 
AccountController.OnlineUsers.Add( new LoggedInUsers( details.MemberName, DateTime.Now ) );

This adds a new user to the OnlineUsers list.

To remove a entry from the list:

In your Logout() method (you have one of these, right?):

Add this:
 
if ( AccountController.OnlineUsers.Count > 0 )
{
  If( AccountController.OnlineUsers.Count > 0 )
  {
    LoggedInUsers member = AccountController.OnlineUsers.First( m => m.MemberName == User.Identity.Name );
    AccountController.OnlineUsers.Remove( member );
  }
}

Just before this:

FormsAuthentication.SignOut();

There is one other place you'll need to add some code and that is in your global.asax Session_End method like this:

protected static void Session_End( object Sender, EventArgs e )
{ 
  if( AccountController.OnlineUsers.Count > 0 )
  {
    LoggedInUsers member    AccountController.OnlineUsers.Find( m => m.MemberName == HttpContext.Current.User.Identity.Name );
    if( member != null )
      AccountController.OnlineUsers.Remove( member );
  }
}

We need to check here if the member is null because if a user logged out he/she will already be removed from the OnlineUsers list.

Next you need to create a partial view method in your controller:

public PartialViewResult OnlineUsers()
{
  List<LoggedInUsers> data = AccountController.OnlineUsers;
  return PartialView( data );
}

Now you can create a partial view for logged in users to see:

@model List<My_MSI.Net.Controllers.LoggedInUsers>
@foreach ( My_MSI.Net.Controllers.LoggedInUsers user in Model )
{
   @Html.Label( @Html.Lable( String.Format( "{0} logged in at {1}", user.MemberName, user.LoggedInTime.Tostring() ) )<br />
}

Finally in your _Layout.cshtml file (You do have one of these, right?):
<div class="move-right">
  @{ Html.RenderAction( "OnlienUsers", "Your controllers name" ); }
</div>

Now you logged in users can see who else is logged in.

If you want to show logged in users you'll have to create this View in your Home controller:

public ActionResult OnlineUsers()
{
  List<LoggedInUsers> data = AccountController.OnlineUsers;
  return View( data );
}

And a View:

@model List<My_MSI.Net.Controllers.LoggedInUser{@ViewBagTitle = "OnlineUsers";Layout = "~/Views/Shared/_Layout.cshtml";}<h2>OnlineUsers</h2>

@foreach ( My_MSI.Net.Controllers.LoggedInUsers user in Model )
{
  @Html.Label( String.Format "{0} logged in at {1}", user.MemberName, user.LoggedInTime.ToString() )<br />
}

Finally add a new menu item for Online Users and link it back to your OnlineUsers() method.

That's it. You've successfully created a list of Online Users that Logged in members can see and a link were the general public can see who's logged in.