private void simpleButtonMergeDiagnosis_Click(object sender, EventArgs e)
        {
            var itemsSelected = listBoxDiagnosis.SelectedItems;

            if (itemsSelected.Count > 1)
            {
                SplashScreenManager.ShowForm(this, typeof(WaitForm1), true, true, false);

                try
                {
                    using (var context = new LorikeetAppEntities())
                    {
                        var dr   = new DialogResult();
                        var form = new FormInput();
                        dr = form.ShowDialog();
                        if (dr == DialogResult.OK)
                        {
                            var diagnosisToAdd = new DiagnosisName();
                            diagnosisToAdd.DiagnosisName1 = form.inputText;
                            context.DiagnosisNames.Add(diagnosisToAdd);
                            context.SaveChanges();

                            int i = diagnosisToAdd.DiagnosisNameID;

                            for (int x = 0; x < itemsSelected.Count - 1; x++)
                            {
                                string diagnosisString = itemsSelected[x].ToString();

                                var diagnosisToUpdate = (from d in context.Diagnosis
                                                         join dn in context.DiagnosisNames on d.DiagnosisNameID equals dn.DiagnosisNameID
                                                         where dn.DiagnosisName1 == diagnosisString
                                                         select d).ToList();

                                if (diagnosisToUpdate.Any())
                                {
                                    foreach (var dtu in diagnosisToUpdate)
                                    {
                                        dtu.DiagnosisNameID = i;
                                        context.SaveChanges();
                                    }
                                }
                            }
                            foreach (var item in itemsSelected)
                            {
                                string itemString = item.ToString();

                                var diagnosisNamesToRemove = (from dn in context.DiagnosisNames
                                                              where dn.DiagnosisName1 == itemString
                                                              select dn).ToList();

                                if (diagnosisNamesToRemove.Any())
                                {
                                    foreach (var dmtr in diagnosisNamesToRemove)
                                    {
                                        context.DiagnosisNames.Remove(dmtr);
                                    }

                                    context.SaveChanges();
                                }
                            }
                        }
                        else
                        {
                            return;
                        }
                    }
                }
                catch (Exception ex)
                {
                    MessageBox.Show(MiscStuff.GetAllMessages(ex));
                }
                SplashScreenManager.CloseForm();
            }
            else
            {
                MessageBox.Show("You must select at least 2 items");
            }
            RefreshListBoxes();
        }