Dynamicly created Radio Buttons

[Wayne Sepega]

I have the following Code:

foreach (MyClass d in myClassCollection)
{
curRadioBtn = new RadioButton();
curRadioBtn.Text = d.ToString();
curRadioBtn.GroupName = "Contact";
curRadioBtn.ID = d.Name;
curRadioBtn.EnableViewState = true;
curRadioBtn.CheckedChanged += RadioButton_CheckedChanged;
curPanel = new Panel();
curPanel.Height = curRadioBtn.Height;
curPanel.Controls.Add(curRadioBtn);
panel1.Controls.Add(curPanel);
}

and I have two other RadioButtons on the form already, they are on Panel1.
The ones on the form cause RadioButton_CheckedChanged to be fired on a post
back, but the dynamiclly created ones don't.

The questions I have are:
1) How do I cause the dynamic radio buttons to fire the event?
2) How do I tell which one is selected, out side of firing the event?
I know I can get the ID in the event from the sender, just curious
on how to do it without the event.
3) When I do the post back all the dynamicly created RadioButtons go away,
how do I force the page to remember them when it's redisplayed without
having to re-create them?

Thanks
Wayne Sepega

 

[Teemu Keiski]

Hi,

there would be answers to those questions, however, have you considered
using easier approach, such as creating them with a Repeater?

Sample (though with textBoxes)
http://forums.asp.net/1158998/ShowPost.aspx

But quick replies:

1. Dynamic controls need to be added on every request and on request
(postback) expecting the events to be raised, they need to be added to
Controls collection at Load event, because postback data loading happens
last time (fixed stage) right after Load.

2. There's not very practical ways. It would need inspecting Request.Form
collection, and locating the control with key there (matching control's
UniqueID), and then getting reference to the instance with Page.FindControl

3. Either with repeater as I demonstrated (Repeater handles control
recreation dirty work), or then just you need to create them on postback,
because postback events won't be raised otherwise.

 

[Jeff]

Here are a few articles that will help to explain the sequence of things and
WHY controls need to be reloaded on each postback - and which event to use -
and other concepts relevant to your question.

http://aspnet.4guysfromrolla.com/articles/081402-1.aspx

http://aspnet.4guysfromrolla.com/articles/092904-1.aspx

http://aspalliance.com/642

http://msdn.microsoft.com/library/d...guide/html/cpconControlExecutionLifecycle.asp

http://www.15seconds.com/issue/020102.htm

http://www.eggheadcafe.com/articles/20050609.asp

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnaspp/html/aspdatastructures.asp

-HTH