Save variable's value between page roundtrip

mistry_bhavin · August 23rd, 2005, 06:59 AM

Dim i As Int16

    Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        'Put user code to initialize the page here

        If (Not IsPostBack) Then
            i = 10
        End If

    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Response.Write(i)
    End Sub

When I write this kind of stuff I get 0 as a value of i.
But if i do not write i = 10 inside the if(not ispostback) then
i get proper value.
So is it nessary to set value for variables every time I load the page? Is't there any way to store variables permanantly, which can
hold their values between page roundtrips?

jbenson001 · August 23rd, 2005, 11:24 AM

Where is the variable i declared????

mistry_bhavin · August 23rd, 2005, 11:39 AM

I is Globaly declared before Page_Load procedure.

Imar · August 23rd, 2005, 12:10 PM

You can store them in ViewState so they survive postbacks:

In Page_Load:

Code:

i = 10
ViewState("MyVar") = i

Then in Button1_Click:

Code:

If Not ViewState("MyVar") Is Nothing Then
  i = Convert.ToIn16(ViewState("MyVar"))
End If

HtH,

Imar
---------------------------------------
Imar Spaanjaars
Everyone is unique, except for me.

charul_shukla · August 24th, 2005, 02:31 AM

You can also use session to store.

Charul Shukla

alyeng2000 · September 3rd, 2005, 03:47 AM

viewstate is prefeared than session when doing postback in the same page

Ahmed Ali
Software Developer

anubhav.kumar · September 3rd, 2005, 08:03 AM

Basically variables which are needed across different page visits (navigation) are to stored in session while viewstate is preffered for page level variables which are excessed across the page visit of the same page( post back)

Anubhav Kumar