Variable Lifetime

[bucrepus]

I created a simple asp.net web application, with a button.
I declared the var tmpStr
Imports ....
Public Class myClass
dim tmpStr as string

Private Sub Page_Load
check for postback and set tmpStr
if not ispostback then
tmpStr = "ABCDEFG"
'I debug check tmpstr here and it is "ABCDEFG"
end if
end sub

AND THE BUTTON CLICK..
private sub myButton_Click(...)
if tmpStr = "ABCDEFG" then do something..
look at the value of tmpStr and it is empty
end sub

Is it normal for tmpStr to loses its value after pageload. tmpstr is null
when I click the button. MSDN says var. retains its value(lifetime) until
app ends if not a local var.
Thanks KT

[Bin Song, MCP]

Hi

You have to understand the sequence of these events
In the first loading of the page, Page_Load is run through, tmpStr is assigned to "ABCDEFG". Button has not been clicked, myButton_Click event is not triggered. Then page unload from server, tmpStr is destroyed
In the upcoming postbacks if myButton clicked, Page_Load is run through, however IsPostback is true, tmpStr is not assigned. myButton_Click event is triggered.
So if tmpStr is assigned to "ABCDEFG" without the condition of IsPostback, you will get the right value in myButton_Click event

Bin Song, MC

----- bucrepus wrote: ----

I created a simple asp.net web application, with a button
I declared the var tmpSt
Imports ...
Public Class myClas
dim tmpStr as strin

Private Sub Page_Loa
check for postback and set tmpSt
if not ispostback the
tmpStr = "ABCDEFG
'I debug check tmpstr here and it is "ABCDEFG
end i
end su

AND THE BUTTON CLICK.
private sub myButton_Click(...
if tmpStr = "ABCDEFG" then do something.
look at the value of tmpStr and it is empt
end su

Is it normal for tmpStr to loses its value after pageload. tmpstr is nul
when I click the button. MSDN says var. retains its value(lifetime) unti
app ends if not a local var
Thanks K

[bruce barker]

a class variable has the same life of its class. it is created and destoryed
when the class is created or destoryed.

on render asp.net create a new version of your page class, calls the events
then releases. when the postback happens the same thing happens as they are
seperate page requests.

-- bruce (sqlwork.com)

"bucrepus" <bu******@hotmail.com> wrote in message
news:uO*************@TK2MSFTNGP12.phx.gbl...

I created a simple asp.net web application, with a button.
I declared the var tmpStr
Imports ....
Public Class myClass
dim tmpStr as string

Private Sub Page_Load
check for postback and set tmpStr
if not ispostback then
tmpStr = "ABCDEFG"
'I debug check tmpstr here and it is "ABCDEFG"
end if
end sub

AND THE BUTTON CLICK..
private sub myButton_Click(...)
if tmpStr = "ABCDEFG" then do something..
look at the value of tmpStr and it is empty
end sub

Is it normal for tmpStr to loses its value after pageload. tmpstr is null
when I click the button. MSDN says var. retains its value(lifetime) until
app ends if not a local var.
Thanks KT