Category: Career Guidance

15 Jun 2015 05:05

Joined:	11/09/2014
Level:	Bronze
Points:	88

Points:	5

How to maintain the correct logged in users count in asp.net application

Hi All,
Today I met a interview question like "Consider a Asp.Net appreciation page, in the top of the page u have a label like Logged in users Count" So u need to show correct logged in users count.
I replied like i will set a flag in userstable in Db and show the result based on that flag count when the page load.

He said k ..If a user properly logged out means u will update the flag in userstable in Db,the question is if users close the browsers tab or the user close the browser means how u will update the users table flag.

Finally he said the answer we can done by using global.asax application close event.

Now I checked,I m having a sample applciation with global.asax file.After i run the application ,I close the tab and also tried with close the tab.But the "Application_End" event not firing.

So how to solve that the above mentioned loggedin users count problem.....

Thanks in Advance :)

#759593

15 Jun 2015 05:36

Joined:	17/03/2009
Level:	Gold
Points:	2282

Points:	4

Hi,

To maintain logged in users count in asp.net application, you need to use Global.asax events. Check the below events which can be used to managed logged in users count

Application_Start()
Session_Start()
Session_End()
Application_End()

simple code
<code>
void Application_Start(object sender, EventArgs e)
{
Application["UsersCount"] = 0;
}

void Session_Start(object sender, EventArgs e)
{
if (Application["UsersCount"] != null)
{
Application.Lock();
Application["UsersCount"] = ((int)Application["UsersCount"]) + 1;
Application.UnLock();
}
}
void Session_End(object sender, EventArgs e)
{
Application.Lock();
Application["UsersCount"] = ((int)Application["UsersCount"]) - 1;
Application.UnLock();
}
</code>

To get the current logged in user, use this code:

string loggedInUser = System.Security.Principal.WindowsIdentity.GetCurrent().Name.ToString();

if you're using membership you can do:
string loggedInUser = Membership.GetUser()

Check the below links for more information
http://www.aspdotnet-suresh.com/2013/11/aspnet-count-number-of-online-users.html
http://www.webcodeexpert.com/2013/10/how-to-count-number-of-times-website.html
http://www.codeproject.com/Articles/29792/Online-active-users-counter-in-ASP-NET
http://www.codeproject.com/Articles/87316/A-walkthrough-to-Application-State

#759596

15 Jun 2015 07:34

Joined:	29/10/2014
Level:	Gold
Points:	1106

Points:	3

Hi,

better u create a application variable in app_start() event in global.asax like:
void Application_Start(object sender, EventArgs e)
{
Application["LoggedinUsersCount"] = 0;
}

same like in session_start(object sender, EventArgs e){

count the user loggedin time , that means u increase the loggedin time by one one..
}

Hope u understnads..

Thanks,
Chitaranjan

#759601

15 Jun 2015 17:24

Joined:	30/04/2012
Level:	Gold
Points:	7233

Points:	3

You can use UsersCount, GuestUsersCount, RegistredUsersCount, SetUserOffline and SetUserOnline methods to maintain correct logged in users count in asp.net application or you can use following code snippet in aspx


<body>
<form id="form1" runat="server">
<table>
<tr>
<td>
<b>Total Number of Online Users</b>
</td>
<td style="color:Red">
<%=Application["OnlineVisitors"].ToString()%>
</td>
</tr>
</table>
</form>
</body>

#759604

15 Jun 2015 19:59

Joined:	12/02/2013
Level:	Gold
Points:	3098

Points:	4

Hi

Use application state or session state to count the onlie users.
By using inproc you can maintain till the browser is closed.

Application state:
1.The application state is maintained in the
application level. It is common for all users in a
application.
2.Application variable can be set as
Application[ "Countvariable" ] = Convert.ToInt
32(Application[ "Countvariable" ]) + 1;
lbl.text= Application[ "Countvariable" ].ToString();
3.Some application events in global.asax are
Application_start
void Application_Start( object sender, EventArgs
e)
{
Application[ "Countvariable" ] = 0;
}

Session state:
1.Session state is maintained user level. It is
different for different users.
2.Session variable can be set as
Session[ "Countvariable" ] = Convert.ToInt
32(Session["Countvariable" ]) + 1;
lbl.text=Session["Countvariable"].ToString();
3.Some session events in global.asax are
Session_Start
void Session_Start( object sender, EventArgs e)
{
Session[ "Count" ] = 0;
}

Regards.

Sridhar Thota.
DNS Member.
"Hope for the best.. Prepare for the worst.."

Sridhar Thota.
Editor: DNS Forum.

#759620

15 Jun 2015 23:26

Joined:	06/04/2012
Level:	Gold
Points:	4230

Points:	4

Hello Ramesh Kumar,

Refer the below code :

protected void Application_Start(object sender, EventArgs e)
{
//Session Count is intialized with 0.
Application["SessionCount"] = 0;
}

protected void Session_Start(object sender, EventArgs e)
{
Application.Lock();

int countSession = (int)Application["SessionCount"];
Application["SessionCount"] = countSession + 1;

Application.UnLock();
}

protected void Session_End(object sender, EventArgs e)
{
Application.Lock();

int countSession = (int)Application["SessionCount"];
Application["SessionCount"] = countSession - 1;

Application.UnLock();
}

Refer the below site for more example :

http://www.webcodeexpert.com/2013/10/how-to-count-number-of-times-website.html

Hope this will help you.

Regards,
Nirav Lalan
DNS Gold Member
"If you can dream it, you can do it."

#759687

18 Jun 2015 04:05

Joined:	23/12/2014
Level:	Silver
Points:	101

Points:	3

Hi Members,

I am learner i start a small project called student info. I create a design and data base i want to insert a data . Would u please help me how to write a insert code to connect the Ms sql data base. I attach a project file in this forum.

With regards
blackcaps
black_caps45@yahoo.in

student-info.rar

Delete Attachment

#759690

18 Jun 2015 05:51

Joined:	06/04/2012
Level:	Gold
Points:	4230

Points:	2

Hello Blackcaps,

Please post your question in different thread.
This thread is created by someone else.

Please don't create spam.

Regards,
Nirav Lalan
DNS Gold Member
"If you can dream it, you can do it."

#759805

22 Jun 2015 08:33

Joined:	28/04/2006
Level:	Gold
Points:	29773

Points:	4

Hai Ramesh,
In the scenario you have given, you need to understand 2 things:
1. The total count of the user will be maintained by the application event and when the user logged in to the web site will be maintained by the session event.
2. Once the user has logged in, you need to increase the number and show using the Application event as it should be displayed to all the users whether they are logged in or not(same as DotNetSpider). Also when the user is logged out, you need to reduce the number and again show to the Application event.
So all these scenario will be handled only by the Application and session events and nothing to do with the database here.
In the Application_Start event, Set the count variable as 0 and increment when a session_Start gets some value. it means when a user logged in to the application.
Same way reduce this variable value when the Session_End is getting called when a user is logged out.
Hope it will give you enough hint to understand.

Regards,
Pawan Awasthi(DNS MVM)
+91 8123489140 (whatsApp), +60 14365 1476(Malaysia)
pawansoftit@gmail.com

How to maintain the correct logged in users count in asp.net application

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