IAD Lab 2 – Page Processing LifeCycle

Problem Statements:
Demonstrate the ASP.NET Page Life Cycle by capturing the Init, Load, Button Click, PreRender, and Unload events.

Code Implementation:
Default.aspx.vb 
'
Partial Class _Default
    Inherits System.Web.UI.Page

    Private Sub _Default_Init(sender As Object, e As EventArgs) Handles Me.Init
        Output.Text &= "1. Page Init Event<br/>"
    End Sub

    Private Sub _Default_Load(sender As Object, e As EventArgs) Handles Me.Load
        Output.Text &= "2. Page Load Event<br/>"
    End Sub

    Private Sub btnTrigger_Click(sender As Object, e As EventArgs) Handles btnTrigger.Click
        Output.Text &= "3. Button Click Event<br/>"
    End Sub

    Private Sub _Default_PreRender(sender As Object, e As EventArgs) Handles Me.PreRender
        Output.Text &= "4. Page PreRender Event<br/><br/>"
    End Sub

    Private Sub _Default_Unload(sender As Object, e As EventArgs) Handles Me.Unload
        ' Cannot update label; used for debugging only
        Output.Text &= "5. Page Unload Event<br/>"
    End Sub
End Class
Default.aspx 
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Page Life Cycle Events</title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <asp:Label runat="server" Text="Page Life Cycle Events" Font-Bold="True" />
            <br /><br />
            <asp:Button ID="btnTrigger" runat="server" Text="Click Me" />
            <br /><br />
            <asp:Label ID="Output" runat="server" Text="" />
        </div>
    </form>
</body>
</html>
Sample Output:

Demonstration:
Launch Demo

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