DropDownList SelectedIndexChanged not firing

Hi fhunter,

Have you tried getting it to work in a fresh project?
1) Add a ComboBox
2) Add some list items by selecting the ComboBox, clicking on Items in the property grid, and then writing a couple of lines
2) Set the DropDownStyle to DropDownList
3) Double-click the ComboBox
4) Add in the SelectedIndexChanged event handler: MessageBox.Show("Test");
5) Run

When you select one of the items does the MessageBox show up? If not, then it probably isn't your code causing the problem. If so, then in your app that isn't working, you might want to make sure that the event handler is attached to the correct ComboBox's SelectedIndexChanged event. Let me know if the above doesn't work.

Thanks,
Scott Morrison
WindowsForms PM
Microsoft Corp.

I'm having a similar problem where no events are firing (_Click, _SelectedIndexChanged, etc.), but this is only happening with one project. Other solutions I'm working on will click and fire perfectly. Copying working code or setting up simple test pages to test the events in the solution with the problem doesn't help. This is VisualStudio.NET 2003 with .NET 1.1

Thanks to anyone who has a potential solution.

I have had and am again having this same bug of ddl SelectedIndexChanged not firing.

When I select a new value on the ddl, the page posts back, the Page_Load function is invoked as PostBack, but the Event handler is never called. I have checked the handler logic in InitializeComponent; it is fine.

Yes, Autopostback is set true.

I use this event all the time. It works on most pages with no problem.

It will not work on the current page I am on, no matter what I do.

I am working in VS, .Net Framework 1.1, developing a webform. All other controls on the webform work fine - buttons, checkboxes and datagrid select.

There are no visible HTML errors on the html page.

I have no clue what else to look at or try.

I would greatly appreciate any insight or direction on where to go to get some actual help with this.

tim

Run the sql and make sure your DataValueField returns Unique values.

I too was experiencing what others have reported - the postback occurs, but the SelectedIndexChanged event is not called.

I think I've found a definitive cause for this and a workaround.

It seems that this event will only fire if the Value property changes. A bit of a bummer if you want different items to return the same value. (I got into this because the same timezone is called different things in different parts of the world.)

The "quick and dirty" code fragments below show the workaround

To load the list (unbound)

N = 0
While dr.Read 'dr is a DataReader
lstTimezones.Value = N.ToString & "|" & dr(0)
... additional code
N = N +1
End While

In the SelectedIndexChanged event:

ValueSplit() As String = Split(lstTimezones.SelectedValue,"|")
TimezoneCode = ValueSplit(1)

Is this an HTML thing or a Microsoft thing? I'd be interested in knowing.

I had the same problem but whenI made auto postback property true, it worked

Thanks

Sree

ya Manpreet's solution works fine .............

even I was facing the same problem & enabling Viewstate Works through it..

Thanx All :-)..

Inderdeep..