How to subscribe to Page Events in Visual Studio 2008 IDE

Question

IMPORTANT
Can any body solve this one ?
How to create page's Init, Load, PreRender etc. event handlers in VS 2008? When we double click on the page, it will create Page_Load event. How to create othere events of page? I am using c# in ASP.NET application.

There is no Event tab in image.

Answer 1

Here is your answer
In the solution explorer, right click the page and select "View component designer" from the context menu, now in the properties window you will have the event tab.

Answer 2

For subscribing to Page events there are following ways:

• override the on_xxx methods of the Web.UI.Page class. For ease just start typing private override when you will type override keyword the Intellisense will automatically tell you the available methods you can override and you can select it from there and press tab (The prototype for the method will automatically be created for you).

• If the page has set AutoEventWireup attribute set to true then you can just define a method with prototype and name as Page_[your event] like Page_Init with appropriate parameters. And the events will will automatically be wired up.

  The ASP.NET page framework supports a mechanism that uses the AutoEventWireup attribute of a Web Forms page to automatically associate page events and event-handler methods. If the AutoEventWireup attribute of the @ Page directive is set to TRUE (or if it is not specified because its default value is TRUE), the ASP.NET page framework automatically calls page event-handler methods.

  For example, the Page_Init and Page_Load event-handler methods are explicitly called by the ASP.NET page framework, without an explicit event delegate.

  However, the drawback of using the AutoEventWireup attribute to automatically associate page events and their event-handler methods, is that event-handler methods must have standard, predefined names. This limits how you can name event-handler methods.

---

Following is the summary of page Events in their order:

• PreInit
• Init
• InitComplete
• PreLoad
• Load
• Control events
• LoadComplete
• PreRender
• SaveStateComplete
• Render
• Unload

---

I usually refer this cheetsheet kind of image from MSDN to check which method to override:

Answer 3

This link may be helpful -- It is the msdn reference for a pages "life cycle" including creating of other events like you mentioned.

http://msdn.microsoft.com/en-us/library/ms178472.aspx

In addition to double clicking on page controls (buttons, hyperlinks, datacontrols), there is a drop-down list when looking at the c# file that contains other "life-cycle" events of a page, as well as other control events you have created.

Answer 4

The way I prefer is to use the On method instead, so type override OnLoad to setup the load event handler, OnPreRender, etc. Each of these methods essentially calls the respective event handler, as in:

protected override void OnInit(EventArgs e)
{
   base.OnInit(e); //don't remove
}

I also think you can add an event handler manually:

protected void Page_Init(object sender, EventArgs e)
{

}

Without needing to set anything up for this (no explicit listening for the event), but I'm not 100% sure of this.

HTH.

Answer 5

Take a look at this: http://msdn.microsoft.com/en-us/library/6w2tb12s%28v=VS.90%29.aspx (VS 2008 version)

It says that you can create a method declaratively with the name Page_event.

For example, to create a handler for the page's Load event, create a method named Page_Load.

ASP.NET pages automatically bind page events to methods that have the name Page_event. This automatic binding is configured by the AutoEventWireup attribute in the @ Page directive, which is set to true by default. If you set AutoEventWireup to false, the page does not automatically search for methods that use the Page_event naming convention.

Worked for me!