Sharing a variable between all pages

[oliv]

Hi,
New to .NET, I was wondering what was the proper way to share a
variable between all the instances of a web page.
I try with a static var, but it does not seem to always work. Why is
that ?


public partial class _Default : System.Web.UI.Page
{

static public string sharedvar;

protected void Page_Load(object sender, EventArgs e)
{
...

thanks

 

[Marc Gravell]

When you say "does not seem to always work" - what happens?

Either way, a static field is a risky proposition in a highly threaded
environment such as ASP.Net; at the very least this should be
protected by a property and synchronised between threads. There may be
more appropriate solutions: what are you trying to do with this var?
What does it hold?

Marc

 

[Guest]

This is probably more of an ASP.NET question than a C# language group one.
Typically in ASP.NET you would store your item either in Session,
Application, or Cache state depending on the business scenario or whether it
is user-specific.
Alternatively, you can put a public static field in your Global class
(global.asax) and you can then use it from any page with:

Global.MyItemName;

Peter

 

[Peter Bradley]

Yeah. The thing is, the Session is more for maintaining state across
different pages associated with the same Session. Perhaps the OP could
explain if these pages are sharing a Session - or if they are in different
Sessions (i.e. a second instance in a second browser instance on the same
client - or even two separate browser instances on different machines with
potentially different users). Until the OP gives us a bit more info about
what is required, it's hard to know what the exact nature of the problem is.


Peter

 

[oliv]

could you provide sample code for storing a var at an application
scope ? (not session scope)

(by "it does not seem to always work", I mean that the static var has
been set by some instance of the page, and another read a null value -
this behavior is different from java as to me)

 

[Jay Warmack]

Sounds like the Singleton pattern is in order here. Google 'Singleton
pattern in C#' and you should find countless examples of the middle tier
code required to implement the concept of global variables in a web or
windows form applcation.