Can also:
lbTemp.SelectedIndex = -1;
or
lbTemp.SelectedItem.Selected = false;
Before selecting a new Item programmatically.
Shouldn't have to walk the entire Collection.
-----Original Message-----
From: Matt Milner [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, May 29, 2002 3:51 PM
To: [EMAIL PROTECTED]
Subject: Re: [DOTNET] ListBox error in ASP.NET
Either disable view state for the control or walk the collection of items
and set "selected" to false for all but the one you want. The control is
holding on to the selected setting from the last post and then you are
probably setting another item to be selected.
HTH,
Matt
Matt Milner
BORN
[EMAIL PROTECTED]
-----Original Message-----
From: Kevin Burton
To: [EMAIL PROTECTED]
Sent: 5/29/02 5:05 PM
Subject: [DOTNET] ListBox error in ASP.NET
I have a ListBox that I only want to have a single item selected at a time
and when that item is selected I want it to be copied into another ListBox
(this is an example in ASP.NET Unleashed p. 224 and 225). The first
selection works just fine but the second selection gives me the following
error. It seems that the error is getting thrown before the first selected
item is unselected. Any ideas as to a work around?
Kevin
A ListBox cannot have multiple items selected when the SelectionMode is
Single.
Description: An unhandled exception occurred during the execution of the
current web request. Please review the stack trace for more information
about the error and where it originated in the code.
Exception Details: System.Web.HttpException: A ListBox cannot have multiple
items selected when the SelectionMode is Single.
Source Error:
An unhandled exception was generated during the execution of the current web
request. Information regarding the origin and location of the exception can
be identified using the exception stack trace below.
Stack Trace:
[HttpException (0x80004005): A ListBox cannot have multiple items selected
when the SelectionMode is Single.]
System.Web.UI.WebControls.ListBox.RenderContents(HtmlTextWriter
writer)
+343
System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer)
+29
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +243
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +72
System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter
writer)
+44
System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output)
+397
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +243
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +72
System.Web.UI.Control.Render(HtmlTextWriter writer) +7
System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +243
System.Web.UI.Page.ProcessRequestMain() +1900
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