Question

Web VB.NET "Global" Variables

Asked by: rcovington

I have a VB.NET application that I need to efficiently share a specific instance of a class (and it's values) between all running instances of the web application.  Other than using a database, is there a more efficient way to share runtime information between all running instances of a specific web application on a single IIS server?

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Asked On
2007-11-03 at 14:44:31ID22937002
Tags

global

,

variable

,

web

Topics

Microsoft Visual Basic.Net

,

Programming for ASP.NET

Participating Experts
3
Points
500
Comments
4

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Answers

 

by: nisarkhanPosted on 2007-11-03 at 15:32:18ID: 20208330

based on what i understood.

you can put your variable in global.asax page in the application_onstart

private const string global_variable = "something"

hth

 

by: tusharashahPosted on 2007-11-03 at 21:04:28ID: 20209370

There are 2 things you can use to store global variables (object of class):
  1. Application state
  2. Cache
The data/object stored in any of above are available for every user & any page of the application.. if data stored is critical and you want it all the time then you can use Application state while if data stored is big and if you want to allow your application to get rid of that data after some time or if memory resources are scarce then you can use Cache..

Here is sample use of Application state
/* To store any value in Application */
Application("PageRequestCount") = 0

/* To retrieve value from Applicatoin state */
If (Not Application("PageRequestCount") Is Nothing) Then
    Dim pageRequestCount As Int = Application("PageRequestCount")
End If

To read more on Application state:
http://quickstart.developerfusion.co.uk/QuickStart/aspnet/doc/applications/default.aspx

Caching can be done very similar way check this tutorial out for that:
 http://quickstart.developerfusion.co.uk/QuickStart/aspnet/doc/caching/data.aspx

It's always a good idea to use one static class in your project to store/retrieve values from cache/application state.. it will allow you to change the method of storing retrieving value in one place if you decide to change the mechanism anytime..

-tushar

 

by: Computer101Posted on 2007-12-14 at 18:26:59ID: 20475816

Forced accept.

Computer101
EE Admin

20120131-EE-VQP-002

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