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ASP.NET PageInit Event

ASP.NET PageInit event will fired first when page is initialised in asp.net page life cycle.

Syntax

protected void Page_Init(object sender, EventArgs e)
{
	//Code will come here. 
}

ASP.NET PageInit Event Example - Default.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" 
Inherits="_Default" %>
<!DOCTYPE html">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Label ID="lblTitle" runat="server" Text="ASP.NET Page Life Cycle"></asp:Label>lt;br />
        <asp:label ID="lblDisplayPageEventsSteps" runat="server" text="Label"></asp:label>
    </div>
    </form>
</body>
</html>

ASP.NET PageInit Event Example - Default.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_PreInit(object sender, EventArgs e)
    {
        //This will fire before page initialised and set value to lable. 
        lblDisplayPageEventsSteps.Text = "This is PreInit Event";
    }
	protected void Page_Init(object sender, EventArgs e)
    {
        //This will fire when the page is initialised and set value to lable. 
        lblDisplayPageEventsSteps.Text += lblDisplayPageEventsSteps.Text = "<br/>This is Init Event";
    }
}

Above example will produce following output

ASP.NET Page Life Cycle
This is PreInit Event
This is Init Event

RequiredFieldValidator

RegularExpressionValidator

RangValidator

CompareValidator

CustomValidator

ValidationSummary