Yes, my bad, it is an ASP.NET, using C# on visual studio 2005.

Thanks for your help.

>So this is an ASP.NET application. I assumed a Windows forms application. I would still watch for the IDE to "lose" event wire-ups sometimes ( at least in VS2003 ). It can be very disconcerting.
>
>>Thanks Bill, I found that the AutoPostBack was set to false, changed to
>>true and that fixed it.
>>
>>>Hi Luis,
>>>
>>>I have found that sometimes, for some reason the IDE "loses" the event wire-up in the code behind. Two things I know of to start looking are to
>>>
>>>1) Check the code behind to make sure the event is wired up. You should have a statement in the form's InitializeComponent() method that looks like:

>>>this.YourDropDown.SelectedIndexChanged += new System.EventHandler(this.YourDropDown_SelectedIndexChanged);

>>>2) Save your code in the SelectedIndexChanged method, remove the method from the control and recreate it to get the IDE to recreate the event wire up.
>>>
>>>Bill
>>>
>>>>Hi Everybody, I'm having a problem with an event that doesn't trigger,
>>>>I drop a DropDownList in my form, lets say "MyDropDown", double click on it
>>>>to create the MyDropDown_SelectedIndexChanged event, so far so good, put some code there like MessageBox.Show("Hello world.") and when I run the page and select a value from the DropDown the event doesn't trigger, what can it be?
>>>>
>>>>Any help would be appreciated, thanks.