Dropdown list cannot have multiple items selected!

  • Thread starter Thread starter Jeff Tolman
  • Start date Start date
J

Jeff Tolman

I'm getting a Server Error page with a "Dropdown list cannot have multiple
items selected" error. First off, my page doesn't even HAVE a dropdownlist
on it. Secondly, there is no Source file listed on the error page, so I'm
not even sure where to look for the problem. The code appears to run just
fine without exceptions all the way through the PreRender Event routine, but
somehow this error appears. Any suggestions?

Here is the text from the error page:

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 DropDownList cannot have
multiple items selected.

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 DropDownList cannot have multiple items
selected.]
System.Web.UI.WebControls.DropDownList.RenderContents(HtmlTextWriter
writer)
System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer)
System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
System.Web.UI.Control.Render(HtmlTextWriter writer)
System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer)
System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter
writer)
System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output)
System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
System.Web.UI.Control.Render(HtmlTextWriter writer)
System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
System.Web.UI.Page.ProcessRequestMain()



All answers are welcome!

Thanks!

Jeff Tolman
E&M Electric
(e-mail address removed)
 
Jeff,

What that error is usually really telling us is that you cannot have one
ListItem object existing in multiple lists. It is, however, perplexing
that you say you have no dropdowns on any pages.

When do you see this error? Can you attach your .aspx and code-behind?

Jim Cheshire, MCSE, MCSD [MSFT]
ASP.NET
Developer Support
(e-mail address removed)

This post is provided as-is with no warranties and confers no rights.

--------------------
From: "Jeff Tolman" <[email protected]>
Subject: Dropdown list cannot have multiple items selected!
Date: Tue, 6 Jan 2004 16:16:31 -0800
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I'm getting a Server Error page with a "Dropdown list cannot have multiple
items selected" error. First off, my page doesn't even HAVE a dropdownlist
on it. Secondly, there is no Source file listed on the error page, so I'm
not even sure where to look for the problem. The code appears to run just
fine without exceptions all the way through the PreRender Event routine, but
somehow this error appears. Any suggestions?

Here is the text from the error page:

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 DropDownList cannot have
multiple items selected.

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 DropDownList cannot have multiple items
selected.]
System.Web.UI.WebControls.DropDownList.RenderContents(HtmlTextWriter
writer)
System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer)
System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
System.Web.UI.Control.Render(HtmlTextWriter writer)
System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer)
System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter
writer)
System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output)
System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
System.Web.UI.Control.Render(HtmlTextWriter writer)
System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
System.Web.UI.Page.ProcessRequestMain()



All answers are welcome!

Thanks!

Jeff Tolman
E&M Electric
(e-mail address removed)
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