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How do I declare a variable and assign the value once, and then reuse that variable in multiple procedures?

Posted on 2008-10-23
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Last Modified: 2012-05-05
Ok, this one is really basic, but for some reason I can't figure it out or find the info on the net.  I want to declare a variable in one spot, say:
Dim strX as string = "X"
and then reference that variable in multiple procedures/functions without having to re-declare it.  The reason being I want to assign paths to the variables, and when the paths change I want to only have to update the variables in one location.
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Question by:stewdaddy
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12 Comments
 
LVL 5

Expert Comment

by:two_people_hk
ID: 22785760
You can set a Constants in Visual Basic.
For your reference:
http://www.go4expert.com/forums/showthread.php?t=3689
0
 
LVL 13

Expert Comment

by:SameerJagdale
ID: 22785762
try using shared keyword.

Shared strX As String = "X"
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LVL 13

Expert Comment

by:TechTiger007
ID: 22785797
declare the variable as member variable in the class so that it is accessible from all functions
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Author Comment

by:stewdaddy
ID: 22785810
Where do I declare the variable though? I thought you do it in the declarations section, but I keep getting a "Statement is not valid in a namespace." error.
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LVL 48

Expert Comment

by:jpaulino
ID: 22785823
You have several options:
- Declare in a module as Public
- Declare in a class as Public Shared
- Define on the settings (My Project - Settings Tab)
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Accepted Solution

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SameerJagdale earned 500 total points
ID: 22785893
put it in main.
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Author Closing Comment

by:stewdaddy
ID: 31509185
Thanks.
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LVL 48

Expert Comment

by:jpaulino
ID: 22785948
Some examples:
' **** CLASS ****
Public Class Class1
    Public Shared myVar As String = "some text"
 
End Class
 
' Then in the form
MessageBox.Show(Class1.myVar)
 
 
' **** MODULE ****
 
Public Module Module1
    Public myNewVar As String = "some text"
 
End Module
 
 
' Then in the form
MessageBox.Show(myNewVar)

Open in new window

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Author Comment

by:stewdaddy
ID: 22786044
jpaulino...
If I go with the module approach, how do I use input from the form, such as:

Public Module Variables
    'Project Directory
    Public strProjectDirectory As String = "J:\" & txtProject.Text & "\"
End Module

VB doesn't let me use txtProject.text
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LVL 48

Expert Comment

by:jpaulino
ID: 22786068

Not that way. You have to declare the variable in the module:

Public strProjectDirectory As String

Then in any place (like in form load event) you can assign the value:

strProjectDirectory  = "J:\" & txtProject.Text & "\"
 
After this you can use it in any place.

 
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Author Comment

by:stewdaddy
ID: 22786101
oh ok thanks
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LVL 48

Expert Comment

by:jpaulino
ID: 22786121
Glad I could help
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