private void addElementToolStripMenuItem_Click(object sender, EventArgs e)
{
if (form == null || form.IsDisposed)
form = new Edition(this);
form.ShowMeAdd();
}
private void editElementToolStripMenuItem_Click(object sender, EventArgs e)
{
if (leftListBox.SelectedItem == null)
{
MessageBox.Show("Не выбран элемент", "Ошибка",
MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
if (form == null || form.IsDisposed)
form = new Edition(this);
form.ShowMeEdit(leftListBox.SelectedItem.ToString());
}