How do I add Page Events for ASP.NET in Visual Studio 2008

Question

This is a bit of a Visual Studio question. I feel with all the helpful Intellisense there should be something to assist but I can't seem to find it.

I made a page with a codebehind in ASP.NET C# in VS2008 and it autogenerates a PageLoad event method, of course. Well, what if I want to add methods for more events besides PageLoad? I would think there would be some list on the Foo.aspx page of possible method event handlers to add. Aren't there more maybe like PageInit, PageDispose, (or equiv) etc...? Where can I find these?

EDIT - I can of course look up the method names in the api. I'm looking for a handy shortcut to add these in Visual Studio. If it generates one, can't it make others?

Diaconicum

Answer 1

• In the solution explorer, right click the page and select "View component designer" from the context menu
• open the properties panel/window (press F4)
• now click the yellow arrow/flash icon and you will see a list of all page events
• double-click the event for which you want to add a handler

I'm pretty sure there was another way (starting from the designer view), but I can't reproduce it.

I usually do not use the page event handlers, instead I override the corresponding methods (e.g. OnLoad instead of Page_Load). To implement one of these overrides, you can simply type "override" in the code-behind and press space to get a list of methods that you can override.

Dexedrine

Works in VS2017! – Hoplite

Tried this in VS2019. It added the events, but none of them were called. I want "Page_Init", not "myPageName_Init". – Absquatulate

Answer 2

With the invaluable ReSharper installed (might work without) I can just type:

override

and when I hit space IntelliSence pops up with a list of all the events that I can override such as OnInit, OnPreRender, etc.

Removal

In VS2010, I don't have ReSharper installed and it seems to do this anyhow. I think this is the easiest approach of all mentioned here thus far. – Ensnare

This works, but there are subtle differences between handling the events and overriding the On_ methods. – Chirlin

Answer 3

as a shortcut to see what's available, you could always just type "Page." and then take a look a the list in intellisense. You could then pick one, hit +=Tab Tab to have it generate the stub for you. once the stub is created, you'd have to delete the "Page.event+=" line wherever you created it. Kind of a hokey workaround, but can work pretty quick once you get the hang of it.

Admissible

Hokey but not pokey - works quickly and easy to remember. Thanks! – Cembalo

This works nicely. Since the event is being handled from a reference named Page, the generated event handler incidentally gets named correctly, ie: Page_Load for the Load event. The only tricky part is that this has to be done from "method scope" since you can't access the Page property at class scope. – Chirlin

Answer 4

In the source code window, from the object list combo box, select the desired control (page). Then from the event list combo box that is to the right of the previous object list combo box select the desired event. Visual studio will create the event handler for you.

Ineslta

Answer 5

If one wants to not use the way as described by M4N but through code:

In the PageName.aspx.cs;

private void InitializeComponent()
{

    // this.LifeCycle += .. // Use intellisense to see alternatives easily
    this.PreRender += new System.EventHandler(this.EventFunctionName);

}

then in the same file add:

private void EventFunctionName(object sender, EventArgs e)
{
    // Code..
}

UPDATE (from comment by Sahuagin): This won't generate an event handler with the appropriate name. The event handler must be named, for example, Page_Load. This will name it after your class rather than after Page, and so it won't actually be hooked up to your page

Wray

Also, this won't generate an event handler with the appropriate name, either. The event handler must be named, for example, Page_Load. This will name it after your class rather than after Page, and so it won't actually be hooked up to your page. – Chirlin

I had originally said that the event handler must be protected and not private. This may or may not be necessary depending on the situation. – Chirlin

Answer 6

TreeScheme.Nodes[0].ChildNodes[0].Checked=true;

treeviewid.node[0].childnodes[0].checked=true;

This will set the child node checked true in page load event of page

happy coding

Jail

what? unless I'm mistaken this has nothing at all to do with the question – Chirlin