Moving items from listbox to listbox

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C#

WPF

ListBox

I've come across numerous articles describing how to move items from one listbox to another. I've applied suggested code to my project but all these examples negate the fact that listbox1 is databound AS WELL AS listbox2 being populated by previously stored data as in there are two bound listboxes in the UI. I've tried ObservableCollections, ArrayList's and now Lists<t>... all with the same end result. Has anyone any advice on how to do this as I get the following error when example code is applied "Operation is not valid while ItemsSource is in use. Access and modify elements with ItemsControl.ItemsSource instead."

PS. Im also trying to have listbox2 spill over into multiple columns by use of datatemplate.

Regards Steven

Code as follows:

cs -

using System;
using System.Windows;
using System.Windows.Input;
using System.Windows.Controls;
using System.Data;
using System.Data.SQLite;
using System.Collections;
using System.Collections.ObjectModel;
using System.Collections.Generic;
using PTWS.Class_Lib;

using System.ComponentModel;
using System.Windows.Data;
using System.Windows.Media;


namespace PTWS.MainPanelControls.FormControls.Permits
{
    /// <summary>
    /// Interaction logic for ColdWorkDraftUControl.xaml
    /// </summary>
    public partial class ColdWorkDraftUControl : UserControl
    {
        PTWDatabase db = new PTWDatabase();
        
        private ObservableCollection<CertificateLookup> CertificateLookupList = new ObservableCollection<CertificateLookup>();

        public ColdWorkDraftUControl()
        {
            InitializeComponent();
            
            LoadDataCertificateLookup();
// all works great untill I uncomment the next line
            //LoadDataCertificateSelected();            
        }

        private void LoadDataCertificateLookup()
        {
            try
            {             
                DataTable conditions;
                String query = "select lc.Section \"Section\""
                    + ", lc.Description \"Description\""
                    + ", lc.SortOrder \"SortOrder\" "
                    + "from LookupConditions lc "
                    + "where not exists (select 1 from SelectedConditions sc where sc.Code = lc.Code and sc.PermitID = 'CWP-12-00001') "
                    + "and lc.Section = 'Certificates'";

                    conditions = db.GetDataTable(query);

                foreach (DataRow r in conditions.Rows)
                {
                    CertificateLookupList.Add(new CertificateLookup()
                    {
                        Section = r["Section"].ToString(),
                        Description = r["Description"].ToString(),
                        SortOrder = r["SortOrder"].ToString()
                    });
                }

               listBoxCertificateLookup.ItemsSource = CertificateLookupList;
            }
            catch (Exception fail)
            {
                String error = "The following error has occurred:\n\n";
                error += fail.Message.ToString() + "\n\n";
                MessageBox.Show(error);
            }
        }

        void LoadDataCertificateSelected()
        {
            try
            {
                DataTable conditions;
                String query = "select Section \"Section\""
                    + ", Description \"Description\""
                    + ", SortOrder \"SortOrder\"";
                query += "from SelectedConditions where PermitID = 'CWP-12-00001' and Section = 'Certificates'";
                conditions = db.GetDataTable(query);

                ObservableCollection<CertificateSelected> CertificateSelectedList = new ObservableCollection<CertificateSelected>();

                foreach (DataRow r in conditions.Rows)
                {
                    CertificateSelectedList.Add(new CertificateSelected()
                    {
                        selectedSection = r["Section"].ToString(),
                        selectedDescription = r["Description"].ToString(),
                        selectedSortOrder = r["SortOrder"].ToString()
                    });
                }
                listBoxCertificateSelected.ItemsSource = CertificateSelectedList;
            }
            catch (Exception fail)
            { 
                String error = "The following error has occurred:\n\n";
                error += fail.Message.ToString() + "\n\n";
                MessageBox.Show(error);
            }
        }

        private void listBoxCertificateLookup_MouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            try
            {
                ListBoxItem myListBoxItem =
                    (ListBoxItem)(listBoxCertificateLookup.ItemContainerGenerator.ContainerFromItem(listBoxCertificateLookup.Items.CurrentItem));
                // listBoxCertificateSelected.DataContext = null;
                listBoxCertificateSelected.Items.Add(myListBoxItem);
            }
            catch (Exception fail)
            {
                String error = "The following error has occurred:\n\n";
                error += fail.Message.ToString() + "\n\n";
                MessageBox.Show(error);
            }
        }

        private void listBoxCertificateSelected_MouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            try
            {
                ListBoxItem myListBoxItem =
                    (ListBoxItem)(listBoxCertificateSelected.ItemContainerGenerator.ContainerFromItem(listBoxCertificateSelected.Items.CurrentItem));

                //listBoxCertificateLookup.DataContext = null;
                listBoxCertificateLookup.Items.Add(myListBoxItem);
            }
            catch (Exception fail)
            {
                String error = "The following error has occurred:\n\n";
                error += fail.Message.ToString() + "\n\n";
                MessageBox.Show(error);
            }
        }
    }
}

xaml-

<UserControl x:Class="PTWS.MainPanelControls.FormControls.Permits.ColdWorkDraftUControl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    
    <Grid>
        <ListBox Name="listBoxCertificateLookup"
                 ItemsSource="{Binding}"
                 MouseDoubleClick="listBoxCertificateLookup_MouseDoubleClick"
                 IsSynchronizedWithCurrentItem="True"
                 HorizontalAlignment="Left" Width="300" Height="75" VerticalAlignment="Top" >
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel Height="23" Orientation="Horizontal">
                        <TextBlock Text="{Binding Path=Description}" VerticalAlignment="Top" />
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
            <ListBox.ItemsPanel>
                <ItemsPanelTemplate>
                    <WrapPanel IsItemsHost="True" Orientation="Vertical" />
                </ItemsPanelTemplate>
            </ListBox.ItemsPanel>
        </ListBox>            
      
        <ListBox Name="listBoxCertificateSelected"
                 ItemsSource="{Binding}"
                 MouseDoubleClick="listBoxCertificateSelected_MouseDoubleClick"
                 HorizontalAlignment="Left" Width="300" Height="75" VerticalAlignment="Top" Margin="0,153,0,0">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel Height="23" Orientation="Horizontal">
                    <TextBlock Name="textBlock" Text="{Binding Path=selectedDescription}" VerticalAlignment="Top" />
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
            <ListBox.ItemsPanel>
                <ItemsPanelTemplate>
                    <WrapPanel IsItemsHost="True" Orientation="Vertical" />
                </ItemsPanelTemplate>
            </ListBox.ItemsPanel>
        </ListBox>
    </Grid>
</UserControl>

class-

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace PTWS.Class_Lib
{
    class CertificateLookup
    {
        public string Section { get; set; }
        public string Description {get; set;}
        public string SortOrder { get; set; }
        public string selectedSection { get; set; }
        public string selectedDescription { get; set; }
        public string selectedSortOrder { get; set; }
    }
}

Solution
AMENDED CS File...MouseDoubleClick event code changes (make appropriate changes to LB2 accordingly)

CertificateLookup myListBoxItem = (CertificateLookup)((ListBox)sender).SelectedItem;
 
CertificateSelectedList.Add(new CertificateSelected()
{
selectedDescription = myListBoxItem.Description
});
 
CertificateLookupList.Remove(myListBoxItem);