Preserve Data-structure on AJAX postback

Question

    Partial Class ClientCenter_UpdateSub
        Inherits System.Web.UI.Page

    Structure PInfo
        Dim Name As String
        Dim Surname As String
    End Structure

    Dim OldPInfo As New PInfo

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not IsPostBack Then
          'blah blah
           OldPInfo.Name = Dt.Rows(0).Item("Name").ToString
           OldPInfo.Surname = Dt.Rows(0).Item("Surname").ToString
end if        
end sub
    End Class

The first time the page loads my structrure is filled correctly. After an AJAX postback all the structure fields are setting to nothing. (It seems that the Dim OldPInfo As New PInfo is called again), but i should better ask the SO Experts.

So anyway, what am i doing wrong here?

Answer 1

First off, You should never assign a variable outside of a property or a method.

Second, web applications are stateless (which means NOTHING is automatically saved from call to call - unless you store it somewhere like Viewstate, Session, etc.).

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