private void посмотретьКнигиToolStripMenuItem_Click(object sender, EventArgs e)
{
if (bookList == null)
{
ViewBookList ViewList = new ViewBookList();
ViewList.MdiParent = this;
ViewList.FormBorderStyle = FormBorderStyle.FixedDialog;
ViewList.FormClosed += ViewList_FormClosed;
ViewList.Show();
}
}
private void ViewList_FormClosed(object sender, FormClosedEventArgs e)
{
bookList = null;
}