Displaying and Editing Multiple Values in CheckListBox Yields this error: SelectedValue which is invalid because it does not exist in the list of items.

I am still working on getting this task resolved. 
I have a SQL field named Cust_Data that stores either one or multiple XML values.  Here is an example:  <Category>Fiction,Horror,Romance</Category>  
I have an .aspx page where I need to display the values in the Category node:
<asp:CheckBoxList ID="cbGenres" runat="server" Text='<%# Bind("Genre") %>' DataSourceID="odsGenres" DataTextField="Category" DataValueField="Category" AppendDataBoundItems = "true" AutoPostBack="true" /> <asp:SqlDataSource runat="server" ID="odsGenres" ConnectionString="<%$ ConnectionStrings:LibraryMedia %>" ProviderName="<%$ ConnectionStrings:LibraryMedia%>" SelectCommand="listGenres&q ...