Question

how to check the duplicate in Application state

My problem scenario:

I stored the username and password in the application[“”] variable.
another user enters the username password i want to check for each and every user.

i tried for for loop but hard to find the count..

could you help me check the duplicate

     for (int j = 0; j < (int)System.Web.HttpContext.Current.Application["Userlogin"].ToString().Length - 1; j++)
                {
                    if (System.Web.HttpContext.Current.Application[i].ToString() == sKey)
                    {
                        Session["duplicateuser"] = "logout";
                        Returnmsg = "-3";
                    }
                }

but it shows the string length of the application[]

Thank in Advance

Answer 1

I stored the username and password in the application[“”] variable

Wow, don’t. The Application state is shared among all users of your application. Never store user specific data in application state. Use Session state instead.

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UPDATE:

If you want to check for concurrent user access you could store a collection of users into the application state such as IEnumerable<string>. Then you could check if a user is already logged in easily:

public bool IsUserLoggedIn(string username, HttpApplicationStateBase application)
{
    var users = application["users"] as IEnumerable<string>;
    if (users == null)
    {
        users = new ConcurrentBag<string>();
        application["users"] = users;
    }

    return users.Any(u => u == username);
}