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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
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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. 
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That's a great idea
But is there anything else so I dont have to hit the database.
Rock Star
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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.
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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[]
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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)
{
if (activeSessionId != HttpContext.Current.Session.SessionID)
}
else
{
}
}
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.
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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
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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.
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Yes I am using system.collection.generic. But dont know why I am still getting the same error.
Thanking You!
Rock Star
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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
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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,
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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...
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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,
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Can Any One Tell Me Where Can I Find A Good ASP.NET With C# For Beggener!!!
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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 
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.
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I Google It A Lot But!!!!!!!!!
All Of It With VB!!!!!!1
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There's really no need for all the exclamation points, and if you truly "googled a lot", you would have found everything you needed to get started.
.45 ACP - because shooting twice is just silly
-----
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"The staggering layers of obscenity in your statement make it a work of art on so many levels." - J. Jystad, 2001
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Emails sending from my application are going to spam folder.why?
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This is because your are sending local server to local..! one reason..!
Test it in production it may not happen..!
If it happens let us know..!
LatestArticle :Log4Net
Why Do Some People Forget To Mark as Answer .If It Helps.
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It is your application that's sending mail rather than someone composing it from mail portals like Yahoo mail or Google mail. Spammmers too work the same way like your application. So it will be seen as spam by your spam filter.
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They smell like meat.
.45 ACP - because shooting twice is just silly
-----
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"The staggering layers of obscenity in your statement make it a work of art on so many levels." - J. Jystad, 2001
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I am working on a web application done in ASP.NET 1.1. The issue I face is I am not able to protect the .pdf files using forms authentication. Though the requests to .aspx web pages are redirected to the login page. the pdf files are getting opened in the browser(which does not happen in 2.0/3.5 versions).
Another issue I ve observed is that none of the Global.asax events are getting fired during such a request.
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