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Please read the below article for getting more information about autoeventwireup property in asp.NET page.
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Please read the below article for getting more information about autoeventwireup property in asp.NET page.
I collect this information from Microsoft site ...
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·
SUMMARY
SUMMARY
This
article discusses the locations where the AutoEventWireup attribute can
be used, the values that the AutoEventWireup attribute accepts, and how
to use the AutoEventWireup attribute effectively in Microsoft ASP.NET Web Forms.
AutoEventWireup is an attribute of the @ Page directive. The AutoEventWireup attribute may have a value of true or false. The value is set to false when you create a new ASP.NET Web Application. This article describes how to set and to change the default values of the AutoEventWireup attribute. This article also describes some of the options of this attribute by using examples of the ASP.NET Web Forms code that is written in Microsoft Visual C# .NET.
You may use the AutoEventWireup attribute to code ASP.NET Web Forms and Web User Controls. When you set the value of the AutoEventWireup attribute to true, the code in ASP.NET Web Forms and in Web User Controls is simple. However, when you use the false value in certain circumstances, you may receive better performance.
You can specify a default value of the AutoEventWireup attribute in several places:
AutoEventWireup is an attribute of the @ Page directive. The AutoEventWireup attribute may have a value of true or false. The value is set to false when you create a new ASP.NET Web Application. This article describes how to set and to change the default values of the AutoEventWireup attribute. This article also describes some of the options of this attribute by using examples of the ASP.NET Web Forms code that is written in Microsoft Visual C# .NET.
You may use the AutoEventWireup attribute to code ASP.NET Web Forms and Web User Controls. When you set the value of the AutoEventWireup attribute to true, the code in ASP.NET Web Forms and in Web User Controls is simple. However, when you use the false value in certain circumstances, you may receive better performance.
You can specify a default value of the AutoEventWireup attribute in several places:
·
The
Machine.config file
·
The
Web.config file
·
Individual
ASP.NET Web Forms (.aspx files)
·
Web
User Controls (.ascx files)
When
you set the value of the AutoEventWireup attribute to true, the
ASP.NET runtime does not require events to specify event handlers like the Page_Load
event or the Page_Init event. This means that in Visual C# .NET, you do
not have to initialize and to create the delegate structures.
When you use Microsoft Visual Studio .NET, the value of the AutoEventWireup attribute is set to false and the designer automatically generates event handlers. This article describes the default settings of the AutoEventWireup attribute and shows you some helpful code.
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When you use Microsoft Visual Studio .NET, the value of the AutoEventWireup attribute is set to false and the designer automatically generates event handlers. This article describes the default settings of the AutoEventWireup attribute and shows you some helpful code.
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Requirements
This
article assumes that you are familiar with the following topics:
·
Programming
in ASP.NET
·
Programming
with Microsoft Visual C# .NET
The
following list outlines the recommended hardware, software, network
infrastructure, and service packs that you need:
·
Microsoft
Visual Studio .NET 2002 or Microsoft Visual Studio .NET 2003
Configuration of the AutoEventWireup
attribute default values
The
AutoEventWireup attribute can be declared in the <pages> section
in the Machine.config file or the Web.config
file. In either of these XML-based files, use the following syntax:
<configuration>
<system.web>
<pages autoEventWireup="true|false" />
</system.web>
</configuration>
If
you make these changes in the Machine.config file, the changes affect all
ASP.NET Web Forms on the computer. If you make
these changes in the Web.config file, the
changes affect only the application that it belongs to.
To change the value of the AutoEventWireup attribute in the individual ASP.NET Web Form, add the AutoEventWireup attribute to the @ Page directive, as follows:
To change the value of the AutoEventWireup attribute in the individual ASP.NET Web Form, add the AutoEventWireup attribute to the @ Page directive, as follows:
<% @Page AutoEventWireup="true" %>
When the value of the AutoEventWireup
attribute is false
If
you want to manually hook up events to an event handler, set the value of the AutoEventWireup
attribute to false. The following sample shows the code that you can use
to handle the Load event of the Page object in an ASP.NET Web Form:
Start Microsoft
Visual Studio .NET.
On the File
menu, point to New, and then click Project.
In the New
Project dialog box, under Project Types, click Visual C# Projects. Under
Templates, click ASP.NET Web Application.
In the Location
box, type the project name as http://ServerName/MyWebApp.
Note Replace ServerName with the name of a server. MyWebApp is the name of a sample ASP.NET Web Application.
Note Replace ServerName with the name of a server. MyWebApp is the name of a sample ASP.NET Web Application.
In Solution
Explorer, right-click the WebForm1.aspx file, click Rename, and then type
EventWireUpFalse.aspx.
Replace the
existing code in the EventWireUpFalse.aspx file with the following code:
<%@ Page Language="C#"
AutoEventWireup="false"
Inherits="MyWebApp.EventWireUpFalse" %>
<HTML>
<HEAD>
<title>Visual C# .NET WIRE-UP FALSE</title>
</HEAD>
<BODY>
<p><% Response.Write(message); %></p>
</BODY>
</HTML>
Replace the
existing code in the EventWireUpFalse.aspx.cs file with the following code:
using System;
namespace MyWebApp
{
public class EventWireUpFalse : System.Web.UI.Page
{ public string message;
private void Page_Load(object sender, System.EventArgs e)
{
message="The Page_Load Event Fired with AutoEventWireup
False";
}
// Visual C# .NET requires that you override the OnInit function,
// adding a new delegate for the Page_Load event.
override protected void OnInit(EventArgs e)
{
this.Load += new System.EventHandler(this.Page_Load);
}
}
}
On the Debug
menu, click Start to build and to run the ASP.NET Web
application.
In this example, you receive a message when the ASP.NET page framework raises the Page_Load event handler. If the value of the AutoEventWireup attribute is set to false, you must override the OnInit function, and then you must add a new delegate for the Page_Load event handler.
In this example, you receive a message when the ASP.NET page framework raises the Page_Load event handler. If the value of the AutoEventWireup attribute is set to false, you must override the OnInit function, and then you must add a new delegate for the Page_Load event handler.
When the value of the AutoEventWireup
attribute is true
When
you set the value of the AutoEventWireup attribute to false, you
must manually hook up events to event handlers. When you set the value of the AutoEventWireup
attribute to true, the ASP.NET page framework can automatically raise
events. The following sample describes how to code a Page_Load event
handler in an ASP.NET Web Form when the value
of the AutoEventWireup attribute is true.
Start Microsoft
Visual Studio .NET.
On the File
menu, point to New, and then click Project.
In the New
Project dialog box, under Project Types, click Visual C# Projects. Under
Templates, click ASP.NET Web Application.
In the Location
box, type the project name as http://ServerName/MyWebApp.
Note Replace ServerName with the name of a server. MyWebApp is the name of a sample ASP.NET Web Application.
Note Replace ServerName with the name of a server. MyWebApp is the name of a sample ASP.NET Web Application.
In Solution
Explorer, right-click the WebForm1.aspx file, click Rename, and then type
EventWireUpTrue.aspx.
Replace the
existing code in the EventWireUpTrue.aspx file with the following code:
<%@ Page Language="C#"
AutoEventWireup="true" Inherits="MyWebApp.EventWireUpTrue"
%>
<HTML>
<HEAD>
<title>Visual C# .NET WIRE-UP TRUE</title>
</HEAD>
<BODY>
<p><% Response.Write(message); %></p>
</BODY>
</HTML>
Replace the
existing code in the EventWireUpTrue.aspx.cs file with the following code:
using System;
namespace MyWebApp
{
public class EventWireUpTrue : System.Web.UI.Page
{
public string message;
private void Page_Load(object sender, System.EventArgs e)
{
message="The Page_Load Event fired with AutoEventWireup True";
}
}
}
On the Debug
menu, click Start to build and run the project.
In this example, you receive a message when the ASP.NET page framework raises the Page_Load event handler. If the value of the AutoEventWireup attribute is true, you do not have to override the OnInit function, and you do not have to add a new delegate for the Page_Load event handler.
In this example, you receive a message when the ASP.NET page framework raises the Page_Load event handler. If the value of the AutoEventWireup attribute is true, you do not have to override the OnInit function, and you do not have to add a new delegate for the Page_Load event handler.
When to avoid setting the value of the
AutoEventWireup attribute to true
If
performance is a key consideration, do not set the value of the AutoEventWireup
attribute to true. The AutoEventWireup attribute requires the
ASP.NET page framework to make a call to the CreateDelegate function for
every ASP.NET Web Form page. Instead of using
automatic hookup, you must manually override the events from the page. For more
information, visit the following Microsoft Developer Network (MSDN) Web site:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dndotnet/html/dotnetperftips.asp
Other places where you can use the
AutoEventWireup attribute
The
AutoEventWireup attribute is also an attribute of the @ Control directive that is used in Web User Controls
(.ascx) pages. You can use the AutoEventWireup attribute in ways that
are similar to those that are described in this article.
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REFERENCES
For
additional information, click the following article numbers to view the
articles in the Microsoft Knowledge Base:
303247
ASP.NET Code-Behind Model overview
312311
How to work with CodeBehind class files in ASP.NET
For more information, visit the following MSDN Web sites:
http://msdn.microsoft.com/library/en-us/cpgenref/html/cpconPage.asp
http://msdn.microsoft.com/library/en-us/cpgenref/html/cpconASPPageSyntax.asp
http://msdn.microsoft.com/library/en-us/vbcon/html/vboriEventHandlingInWebForms.asp
http://msdn.microsoft.com/library/en-us/cpguide/html/cpconevents.asp
http://msdn.microsoft.com/library/en-us/cpgenref/html/cpconASPPageSyntax.asp
http://msdn.microsoft.com/library/en-us/vbcon/html/vboriEventHandlingInWebForms.asp
http://msdn.microsoft.com/library/en-us/cpguide/html/cpconevents.asp
Keywords:
kbEvent kbHOWTOmaster kbWebForms KB324151
Technology: kbASPNet100 kbASPNet110 kbASPNetSearch kbASPsearch kbAudDeveloper kbVCsearch kbVCSharpNET2002 kbVCSharpNET2003 kbVCSharpNETSearch
Technology: kbASPNet100 kbASPNet110 kbASPNetSearch kbASPsearch kbAudDeveloper kbVCsearch kbVCSharpNET2002 kbVCSharpNET2003 kbVCSharpNETSearch
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