Determining item count of databound DropDownList

[Kyle K.]

Environment: ASP.NET 2 on WinXP SP2 w/ VS2005

I have a Databound DropDownList control on a templated page that I would
like to conditionally display as determined by the # of items in the
control.

Using a MultiView control...
Count = 0, display a message (view1)
Count > 0, display DropDownList & Button (view2)

I need the ability to programatically set which view is displayed AFTER
the DropDownList has loaded the data from the database.

I tried placing the code to do this inside the Page_Load() &
(controlName)_DataBound() events, but the Page_Load() event is called
before the data is bound and the (controlName)_DataBound() event doesn't
get called at all (breakpoint not reached when debugging the page).

Not sure if it matters or not, but I am using an ObjectDataSource that
references a DataSet (.xsd).

What method should I use in order to determine which view is displayed
at runtime?

-={ Kyle K }=-

 

[Phillip Williams]

Hi Kyle,

1- you can get the count while handling the Selected event of the
objectDataSource. You may look at the code of this demo for an example:
http://www.webswapp.com/codesamples/aspnet20/dropdownlist_gridview/default.aspx

2- the reason your (controlName)_DataBound() event was not fired could be
that you have not wired the event handler to the event. For example, have
you added OnDataBound="controlName_DataBound" to the markup of the
dropdownlist?

 

[Kyle K.]

I figured it out (while checking out solution #1 below)...

If the View that contains the DropDownList is not active when the page
is loaded, then the DataBound event won't get fired.

I had left the MultiView's ActiveViewIndex = -1 (default), meaning none
of the views get displayed. I figured that I'd just choose the one to
display at run-time. Once I switched this to show the view that
contained the DropDownList by default, then the DataBound event fired.

Thanks for the help!

-={ Kyle K }=-