Hi,

What is the best method to define gloabl variable in asp.net application that should be global for single instance of applicantion and different for each instance of application for each user connected.

Application class: unique across entire application.

Session class: unique for each user.

Sorry, don't understand!

Can you please give some example of how to declare these variables...

In VB.NET - Application("VariableName") = "Some Value"

 I have declared some variables in my web application like this:

Public SelectedProductID As Integer

the problem is that when one user loads the website and select a product, the other user gets the same SelectedProductID as the user 1. How can i define SelectedProductID variable so that it is diffirent for each web user?

Thanks.

nmufti:

Hi,

What is the best method to define gloabl variable in asp.net application that should be global for single instance of applicantion and different for each instance of application for each user connected.

For Your requirement session state is suitable

signle instance of application

different for each user

http://msdn.microsoft.com/en-us/library/ms178581.aspx

nmufti:

 I have declared some variables in my web application like this:

Public SelectedProductID As Integer

the problem is that when one user loads the website and select a product, the other user gets the same SelectedProductID as the user 1. How can i define SelectedProductID variable so that it is diffirent for each web user?

Thanks.

From the sounds of things, you may need to post some source code so we can see what you're talking about more clearly. But in this case, you may not need either application or session variables. For performance reasons, you should avoid session variables wherever possible.

Hi nmufti,

As far as I know, the best way is to define the varable in Global class. 

//Global class
public static class Global
{
    static string _importantData;

    public static string ImportantData
    {
        get
        {
            return _importantData;
        }
        set
        {
            _importantData = value;
        }
    }
}

//Page.aspx

protected void Page_Load(object sender, EventArgs e)
{
        // Get the current ImportantData.
        string important1 = Global.ImportantData;

        // If we don't have the data yet, initialize it.
        if (important1 == null)
        {
            important1 = DateTime.Now.ToString();
            Global.ImportantData = important1;
        }

        // Render the important data.
        Important1.Text = important1;
    }

Thanks,

Will this "_importantData" holds different value for each user connected to website and loads the Page.aspx.

e.g. I want to store userName like this and want to display userName on each page of my website. Will this example work for this case? 

Hi nmufti,

Maybe you have misunderstood my meaning, The global data will only be run once for your entire application. so it is not based on single user.

From your description, the best way for your requirement is to use the Session object.

A session is the time for which a particular user interacts with a web application . During a session the unique identity of the user is maintained internally. A session ends if there is a session timeout or if you end the visitor session in code.
 
Sessions helps to preserve data across successive accesses. These can be done on a per user basis, via the use of session objects. Session objects give us the power to preserve user preferences and other user information when browsing a web application. To better understand the use of sessions, consider an example: Suppose you own a website in which you give the visitors the option to choose the background color of the pages they will browse. In such a case you need to remember the user’s choice on each of the page. This task can be accomplished using sessions.
ASP.NET Session State
http://msdn.microsoft.com/en-us/library/ms972429.aspx

Session FAQ
http://www.syncfusion.com/faq/aspnet/web_c9c.aspx

Underpinnings of the Session State Implementation in ASP.NET
http://msdn.microsoft.com/en-us/library/aa479041.aspx

Let me know whether that answers your question, or if I've missed something.