Friends,
I have a problem with page_load() executing twice. I have reviewed the
archive and previous answers don't seem to apply.
I have stripped my program down to almost nothing to demonstrate the
problem. My page only has a listbox control that I created using Visual
Studio .NET. I have set AutoPostBack to true to respond to selection
clicks. This is what was generated by VS:
<%@ Page Language="vb" AutoEventWireup="false"
Codebehind="WebForm1.aspx.vb" Inherits="ListBox2.WebForm1"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<title>WebForm1</title>
<meta content="Microsoft Visual Studio.NET 7.0"
name="GENERATOR">
<meta content="Visual Basic 7.0" name="CODE_LANGUAGE">
<meta content="JavaScript" name="vs_defaultClientScript">
<meta
content="http://schemas.microsoft.com/intellisense/ie5"
name="vs_targetSchema">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<asp:listbox id="lstEmployee" style="Z-INDEX: 101;
LEFT: 38px; POSITION: absolute; TOP: 42px" runat="server" Height="204px"
Width="148px" AutoPostBack="True"></asp:listbox></form>
</body>
</HTML>
In my VB code, I fill the listbox with four entries. The code looks like
this:
Public Class WebForm1
Inherits System.Web.UI.Page
Protected WithEvents lstEmployee As System.Web.UI.WebControls.ListBox
#Region " Web Form Designer Generated Code "
'This call is required by the Web Form Designer.
<System.Diagnostics.DebuggerStepThrough()> Private Sub
InitializeComponent()
End Sub
Private Sub Page_Init(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Init
'CODEGEN: This method call is required by the Web Form Designer
'Do not modify it using the code editor.
InitializeComponent()
End Sub
#End Region
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
' Fill the list box with 4 iems
If Not IsPostBack Then
lstEmployee.Items.Add("item1")
lstEmployee.Items.Add("item2")
lstEmployee.Items.Add("item3")
lstEmployee.Items.Add("item4")
End If
End Sub
Private Sub lstEmployee_SelectedIndexChanged(ByVal sender As
System.Object, ByVal e As System.EventArgs) Handles
lstEmployee.SelectedIndexChanged
' Selection code here
End Sub
End Class
When I run the application (using the debugger to see what is happening),
I find that the initial load goes as expected as does the first selection
click. On the second and all subsequent selection clicks, Page_Load and
lstEmployee_SelectedIndexChange are both executed twice.
I have tired a variety of settings but I can't seen to get this to work
without breaking something else.
Can anybody help?
Thanks,
Jim Henze
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