Why won't my multi select work?

My multi-select list box is not working.  This is probably something simple.  I am making sure that I hold the CTRL key before I select the authors' names, too.  

Here is my code:

<asp:DropDownList ID="listAuthors" 
          runat="server" 
          AppendDataBoundItems="True" 
          DataSourceID="Authors_ds" 
          DataTextField="Authorame"  
          SelectionMode="Multiple" 
          AutoPostBack = "true">
    <asp:ListItem Text="Select Authors" Value="~Select Author~" />    
    </asp:DropDownList>           
     

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programmherAsked:
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Amandeep Singh BhullarConnect With a Mentor Commented:
Hi, i don't think drow down list will be able to provide this functionality

The property added
SelectionMode="Multiple"
is not the ASP.net control property.

If you want to achive this then try using some other control like list items or give a try to example shared by 13Shadow


Hope this will help
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13ShadowCommented:
Is your DataTextField supposed to be "Authorame"  or Authorname or AuthorName?

When you say it is not working what exactly is it not doing?
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programmherAuthor Commented:
13Shadow,

The DataTextField is supposed to be AuthorName.

I am unable to select more than one author's name at a time.  

I can only select one author's name at a time.

 So, if 25 authors are displayed, I want to be able to select more than one author's name.
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programmherAuthor Commented:
I am trying to download the zip file but keep getting an error.

Do you have another link that I can use to download the example?

Aman, do you have a link to an example that uses list items?
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programmherAuthor Commented:
Aman,

I changed my code to this:

<asp:DropDownList runat="server" ID="lbGenreList" 
                 style="float:left;" DataSourceID="Genres" 
                 DataTextField="AuthorName"  
                 onselectedindexchanged="genreList_SelectedIndexChanged" 
                 AutoPostBack="True" AppendDataBoundItems="true">
              
</asp:DropDownList>



<asp:ListBox runat="server" 
DataSource="Authors_ds" 
DataTextField ="AuthorName" 
ID = "AuthorList" 
SelectionMode="Multiple" 
OnSelectedIndexChanged = "AuthorList_SelectedIndexChanged" />

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This is my error:  The 'DataSource' property cannot be set declaratively.

What I need to happen is that the user selects their genre from the first dropdown box (ex: Horror).

The second list box displays all the authors names the library has who have written Horror books.  The users need to select one or more of the authors listed.
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programmherAuthor Commented:
I changed my listbox to this and it resolved the error:

 <asp:ListBox runat="server" ID="AuthorList" DataTextField="AuthorName" 
            DataValueField="AuthorName" DataSourceID="Authors"  SelectionMode="Multiple"/>

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      Thank you for your help.

My last step is to get the selected author (or authors) to update into my database.
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