private void CustomGenerate_Click(object sender, EventArgs e)
        {
            CustomResault.ForeColor = Color.Black;
            int cnt = 0;

            for (int i = 0; i <= (CustomListBox.Items.Count - 1); i++)
            {
                if (CustomListBox.GetItemChecked(i))
                {
                    cnt = (i + 1);
                }
            }
            if (cnt >= 2)
            {
                for (i = 0; i <= (CustomListBox.Items.Count - 1); i++)
                {
                    if (CustomListBox.GetItemChecked(i))
                    {
                        CustomList.Add(CustomListBox.Items[i].ToString());
                    }
                }
                result = Convert.ToString((string)CustomList[random.Next(0, CustomList.Count)]);
                Timer4Custom.Start();
            }
            else
            {
                MessageBox.Show("2つ以上の登録が必要", "Error");
            }
        }
 private void DeleteCustom_Click(object sender, EventArgs e)
 {
     for (i = 0; i <= (CustomListBox.Items.Count - 1); i++)
     {
         if (CustomListBox.GetItemChecked(i))
         {
             RemoveCustomRecord(CustomListBox.Items[i].ToString());
         }
     }
     RefreshCustomList();
 }