Append listbox C#

[k005]

        private void btnEkle_Click(object sender, EventArgs e)
        {
            this.Hide();


            {

                var typeValueArray = new Adb.TypedValue[]
                {
                    new Adb.TypedValue((int)Adb.DxfCode.Operator, "<or"), // start ORing
                    new Adb.TypedValue((int)Adb.DxfCode.Start, "Text"),
                    new Adb.TypedValue((int)Adb.DxfCode.Start, "MText"),
                    new Adb.TypedValue((int)Adb.DxfCode.Operator, "or>"), // end ORing
                                                                          // to get any ACAD Obj dxf name (Text, MText , ...) use ACAD LIST command.
                };

    


                SelectionFilter filter;
                if (chcBKirmizi.Checked == true)
                {
                    filter = new SelectionFilter(new[] { new Adb.TypedValue(0, "TEXT"), new Adb.TypedValue(62, 1) });
                }
                else
                {
                    filter = new SelectionFilter(new[] { new Adb.TypedValue(0, "TEXT"), new Adb.TypedValue(1, TxtSecimkriter.Text) });
                }

                var selectionOptions = new PromptSelectionOptions()
                {

                    MessageForAdding = "select texts",
                };
                var selectionResult = Adoc.Editor.GetSelection(selectionOptions, filter);
                if (selectionResult.Status != PromptStatus.OK)
                {
                    Adoc.Editor.WriteMessage($"\n----- Seçilecek Obje Bulunamadı.! ------");
                    return;
                }
                var allTextIDs = selectionResult.Value.GetObjectIds();
                List<string> allText = new List<string>();

                using (var ts = Adb.HostApplicationServices.WorkingDatabase.TransactionManager.StartTransaction())
                {
                    Type type;

                    foreach (var id in allTextIDs)
                    {

                        var dbObj = id.GetObject(Adb.OpenMode.ForRead);
                        type = dbObj.GetType();
                        if (type.Equals(typeof(Adb.DBText)))
                        {

                            if (chcbPoz.Checked)
                            {
                                allText.Add(allText.Count + 1 + "   " + ((Adb.DBText)dbObj).TextString);
                            }
                            else
                            {
                                allText.Add(((Adb.DBText)dbObj).TextString);
                            }

                        }
                        else if (type.Equals(typeof(Adb.MText)))
                        {
                            allText.Add(((Adb.MText)dbObj).Text);
                        }
                    }
                }

                lblListCount.Visible = true;

                listBox1.DataSource = allText;

                lblListCount.Text = "Toplam: " + listBox1.Items.Count.ToString();
                this.Show();

            }
        }

Hello

How can we continue to add data to the listbox with checkbox control?

If the checkbox is checked, you can add data.

Thanks.