How to declare an application-wide static variable in ASP.net (VB)

Hi ASP.net (VB) experts,

for my ASP.net (VB) application I would like to declare a variable that is globally shared between all sessions, which will be used for some low-level system task. Just to make sure: I want that if one session changes the value, it is also changing in another session of the web site.

I have googled around, but many posts refer to "static" declarations, others to "global" or "shared", others yet mention that c# "static" is the same as vb "shared". Then I don't quite understand where (i.e. in which file in which directory, like App_Code etc.) and how (class or module or whatever) I should define such a variable. I'm totally confused.

Could someone please help me understand this and tell me how I can define a string variable named "status" that is accessible throughout the application, i.e. with the same shared content in all sessions? Some code example would be highly appreciated. (I am aware that I haven't fully understood the life-cycle and inheritance issues here, but for the time being, I'm happy with a kick-start on this globally-shared-variable-issue.)

Thank you in advance,
Thomas
StaudteAsked:
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mcs0506Commented:
Hi

To Share the data with all application users, you can use ASP.NET Application object. Given is the sample code to access Application object in ASP.NET:

Dim htblGlobalValues As Hashtable = Nothing

If Application("GlobalValueKey") IsNot Nothing Then
      htblGlobalValues = TryCast(Application("GlobalValueKey"), Hashtable)
Else
      htblGlobalValues = New Hashtable()
End If

htblGlobalValues.Add("Key1", "Value1")
htblGlobalValues.Add("Key2", "Value2")

Me.Application("GlobalValueKey") = htblGlobalValues


Application["GlobalValueKey"] can be used anywhere in the whole application by any user. It will be common to all application users.
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StaudteAuthor Commented:
Hi,

thanks for the quick answer - which is undoubtedly correct for the question I asked. Unfortunately, in my attempt to formulate a simplified question, I simplified a bit too much :-}

I actually need to instanciate a control such as
dim MyControl as new MasterController

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and want MyControl to be globally shared, so that properties can be accessed and modified throughout the application.

Sorry, my fault. Can you still help me?
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mcs0506Commented:
Hi,
Try to create HashTable with Object as its value
e.g.
htblGlobalValues.Add("Key1", Object)

then  you can get this object and cast it to MasterController where you need in the application.


Dani
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StaudteAuthor Commented:
Well, I think I have found the (simple) answer to my question now:

create a class file in App_Code and fill it with this code:

Public Class UtilsClass
    Public Shared MyGlobalObject As Object 'String or whatever
End Class

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then Import this class in each codebehind using

Imports UtilsClass

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StaudteAuthor Commented:
Using the Application object is undoubtedly on way to skin this cat - not what I had in mind, but that's due to my incorrect asking. As the answer (that I found myself) is much simpler than the proposed approach, I only award it a "B".
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