I have a Combobox where the list can be edited and I'm trying to update the text which is read from 2 database tables but I'm having trouble doing that.

Customer Table: CustomerID and Customername (Lookup Table)
Product Table: Customer (Contains the CustomerID from Customer Table)

This is my code:
Code:
<asp:FormView ID="FormView2" runat="server" DataSourceID="SqlDataSource1">
         <EditItemTemplate>
              <table  class="contentEdit">
                    <tr>
                         <td>
                            <asp:TextBox ID="TextBoxDescription" runat="server" Text='<%# Bind("Description") %>' /></td>
                        <td>
                             <asp:ComboBox ID="ComboBoxCategory" runat="server" AppendDataBoundItems="True" 
                                AutoCompleteMode="SuggestAppend" AutoPostBack="False" SelectedValue='<%# Bind("Category") %>'
                                DataSourceID="SqlDataSourceCategory" DataTextField="CategoryName" AllowCustomText="True"  
                                DataValueField="CategoryID" MaxLength="0" style="display: inline;">
                                 <asp:ListItem Text="Select/Enter New Value" Value="" />
                            </asp:ComboBox>
                            <asp:SqlDataSource ID="SqlDataSourceCategory" runat="server" 
                                ConnectionString="<%$ ConnectionStrings:ProdConnectionString %>" 
                                SelectCommand="SELECT * FROM [Category]"></asp:SqlDataSource>
                            <asp:SqlDataSource ID="SqlDataSource2" runat="server"></asp:SqlDataSource>
                     </td>
                            </tr>
                        
                <asp:LinkButton ID="UpdateButton" runat="server" CausesValidation="True" 
                    CommandName="Update" Text="Update" CssClass="button" />
                &nbsp;<asp:LinkButton ID="UpdateCancelButton" runat="server" 
                    CausesValidation="False" CommandName="Cancel" Text="Cancel"  CssClass="button"/>
                <br /> <br />
           
                </td>
                </tr>
                </table>
           
            </EditItemTemplate>
        </asp:FormView>
        
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" CancelSelectOnNullParameter="false"
            ConnectionString="<%$ ConnectionStrings:ProdConnectionString %>"  
             SelectCommand="SELECT * FROM [Products]" 
            
            UpdateCommand="UPDATE Products SET [ProdNum] = @ProdNum, [Description] = @Description, [Category] = @CategoryValue
            WHERE ProductID = @ProductID;
           
            UPDATE Category Set CategoryName =  @CategoryName
            WHERE CategoryID= @Category;">            
           
                      <UpdateParameters>
                 <asp:Parameter Name="ProductID" Type="Int32" ConvertEmptyStringToNull="true" />
                <asp:Parameter Name="ProdNum" Type="String" ConvertEmptyStringToNull="true" />
                <asp:Parameter Name="Description" Type="String" ConvertEmptyStringToNull="true" />
                <asp:Parameter Name="Category" Type="String" ConvertEmptyStringToNull="true" />
                <asp:ControlParameter ControlID="FormView2$ComboBoxCategory" Name="CategoryName" PropertyName="SelectedItem.Text" Type="String" />
   	<asp:ControlParameter ControlID="FormView2$ComboBoxCategory" Name="CategoryValue" PropertyName="SelectedItem.Value" Type="Int32" />

           </UpdateParameters>
          

        </asp:SqlDataSource>
</div> 
     
    
 </form>

I tried :
 <asp:ControlParameter ControlID="FormView2$ComboBoxCategory" Name="CategoryName" PropertyName="SelectedText" Type="String" />
     <asp:ControlParameter ControlID="FormView2$ComboBoxCategory" Name="CategoryValue" PropertyName="SelectedValue" Type="Int32" />
But got the error:
'AjaxControlToolkit.ComboBox' does not contain a property with the name 'SelectedText'

I'm really stuck and can't find a way to update a comboBbox.
Thanks so much for your help.