ASP.NET

16-Dec-09 1:00

Hi,
I want to know how can I have single active session for single user?

For ex.
Consider I login to website and after successful login my ID is stored in session and If I leave this session in active mode and login to the website using another PC I am able to login to the site and both of my session are active. How can I abandon previous session?
Is there anyway I can achieve this?

Thanking You!

Rock Star

souidi abderrahman16-Dec-09 1:11

souidi abderrahman

16-Dec-09 1:11

the server allow only single session!!! Confused | :confused:

Rock Star.16-Dec-09 1:15

16-Dec-09 1:15

Nope

I am just using one session in application to store user id thats it.

Rock Star

m-khansari16-Dec-09 1:25

m-khansari

16-Dec-09 1:25

Hi
Why did not you deny that log-on when someone have logged on via that account already?

Mohammad Khansari

Rock Star.16-Dec-09 1:34

16-Dec-09 1:34

I dont want to hit my database for it. without hitting my database I want to achieve this functionality.

Rock Star

m-khansari16-Dec-09 2:30

m-khansari

16-Dec-09 2:30

You can create a static class that contains

SessionIDs and UserIDs(or IPAddresses) that logged on

and use that for checking log-on.

like

static class SessionList
{
static ArrayList Sessions;
...
}

OR

You can use Applications State for that

Mohammad Khansari

Abhishek Sur16-Dec-09 1:35

16-Dec-09 1:35

Just put the ip to storage while the user logs in. Also for every request, check if the client ip is there in the server.

If the user logs in from another computer, just replace the ip with the new one.

Thus any request from the other client will be rejected as it first checks to the database value which is changed. Wink | ;)

Abhishek Sur
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Rock Star.16-Dec-09 2:12

16-Dec-09 2:12

That's a great idea
But is there anything else so I dont have to hit the database.

Rock Star

Abhishek Sur16-Dec-09 6:03

16-Dec-09 6:03

You might use Cache or Application. Both are Global and In memory shared variable. In case of application you use :

Application.Lock();
Application[currentUserName] = IP;
Application.UnLock();

If you are using Cache, you dont need to lock as it handles automatically. Wink | ;)

Abhishek Sur
Don't forget to click "Good Answer" if you like this Solution.
My Latest Articles-->
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Microsoft Bing MAP using Javascript

DJ Matthews16-Dec-09 2:30

DJ Matthews

16-Dec-09 2:30

You may want to try looking at the cache class. It's like a session, but it's application level(from what I've been reading about it)

MSDN Link[]

Paulo Zemek16-Dec-09 9:29

Paulo Zemek

16-Dec-09 9:29

The solution I will give you will only work if you are NOT in a web-farm and if you have a Session manager that supports informing you when a session dies.

Create a dictionary, like:

private static Dictionary<string, string> _someDictionaty = new Dictionary<string, string>();

Each time a user log-ins (after you validated the password) will do:

lock(_someDictionary)
  _someDictionary[...loginHere...] = HttpContext.Current.Session.SessionID;

Except from the login page, you must check if the "actual" session is the active session for logged user. So:

string activeSessionId;
lock(_someDictionary)
{
if (_someDictionary.TryGetValue(...loginHere..., out activeSessionId)
{
    // Some old session was found for this ID, so check if it is the same or not.
    if (activeSessionId != HttpContext.Current.Session.SessionID)
       // the activeSession is not this... so, show an error? Redirect to login?
  }
  else
  {
    // There is no session registered for this login. Is this an error?
  }
}

And finally, in Global.asax, in the Session_End method, you must remove the session for that user, so:

var pair = new KeyValuePair<string, string>(...loginHere..., HttpContext.Current.Session.SessionID);
IDictionary<string, string> dictionary = _someDictionary;

lock(_someDictionary)
  dictionary.Remove(pair);

I used the Remove that accepts a key/value pair because if a session ends that is not the valid one we must simple ignore it.

Rock Star.17-Dec-09 3:35

17-Dec-09 3:35

Thanx Buddy

Rock Star

Rock Star.18-Dec-09 4:47

18-Dec-09 4:47

Hi,
I m getting the following errors.

Error 1 The type or namespace name 'KeyValuePair' could not be found (are you missing a using directive or an assembly reference?)

Error 2 The non-generic type 'System.Collections.IDictionary' cannot be used with type arguments

Error 3 The name '_someDictionary' does not exist in the current context D:\Projects\Demo\Website\Global.asax

Error 4 The name '_someDictionary' does not exist in the current context D:\Projects\Demo\Website\Global.asax

And it is not allowing me to declare dictionary as private static

Rock Star

Paulo Zemek18-Dec-09 10:11

Paulo Zemek

18-Dec-09 10:11

If I am not wrong, the KeyValuePair and the Dictionary classes are in the System.Collections.Generic

But, to be honest, I always use the editor to add them to me. When you put the caret in the class name, a small rectangle appears. Click in it, and one of the options is to add the using reference.

Rock Star.20-Dec-09 20:41

suggest word when typed on Textbox

20-Dec-09 20:41

Yes I am using system.collection.generic. But dont know why I am still getting the same error.

Thanking You!

Rock Star

Any_India16-Dec-09 0:55

Any_India

16-Dec-09 0:55

Is there any one who know how to use textbox as suggest word which will fached from database

i used ajax tool autocompliteextender but it doesnt fire function of webservice.asmx.is ther any step by step processer for this.

if require i will Show my current code which is not working.

plz help me

Re: suggest word when typed on Textbox

Abhijit Jana16-Dec-09 2:09

Abhijit Jana

16-Dec-09 2:09

Please have a look :
AJAX AutoComplete/AutoSuggest TextBox[^]

Abhijit Jana | Codeproject MVP
Web Site : abhijitjana.net
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Issue with Cached user control

kingshez16-Dec-09 0:54

kingshez

16-Dec-09 0:54

HI
I have cached user control, which has two link buttons on it and it is present in the whole application, i have cached it, but now link buttons events are not firing, any body know whts the issue, kindly reply ASAP, thanks in adavance.

regards,

Re: Issue with Cached user control

Abhishek Sur16-Dec-09 6:53

Re: Issue with Cached user control

16-Dec-09 6:53

How you did cache on the buttons?
Did you put output cache on the page?

Let share your code, otherwise no one will understand what problem you found...

Abhishek Sur
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kingshez16-Dec-09 19:17

kingshez

16-Dec-09 19:17

I cached the whole user control which contained the two link buttons as well with the cache out put directive @outputcache on the top of user control,

ASP.NET With C#

sanforjackass16-Dec-09 0:02

sanforjackass

16-Dec-09 0:02

Can Any One Tell Me Where Can I Find A Good ASP.NET With C# For Beggener!!!

Re: ASP.NET With C#

Abhijit Jana16-Dec-09 0:23

Abhijit Jana

16-Dec-09 0:23

sanforjackass wrote:
Can Any One Tell Me Where Can I Find A Good ASP.NET With C# For Beggener!!!

So you are looking for some beginners tutorials.
Have a look Smile | :)

Asp.net beginners tutorials[^]

Abhijit Jana | Codeproject MVP
Web Site : abhijitjana.net
Don't forget to click "Good Answer" on the post(s) that helped you.

Re: ASP.NET With C#

sanforjackass16-Dec-09 0:40

sanforjackass

16-Dec-09 0:40

I Google It A Lot But!!!!!!!!!
All Of It With VB!!!!!!1

Re: ASP.NET With C#

Abhishek Sur16-Dec-09 1:31