private void  项OToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (!loginMode || !sysLogin)
            {
                MessageBox.Show("只有管理员有此权限", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }
            DeleteBookForm DeleteBookFm = new DeleteBookForm();

            DeleteBookFm.ShowDialog();
        }
 private void 选项OToolStripMenuItem_Click(object sender, EventArgs e)
 {
     if (!loginMode || !sysLogin)
     {
         MessageBox.Show("只有管理员有此权限", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
         return;
     }
     DeleteBookForm DeleteBookFm = new DeleteBookForm();
     DeleteBookFm.ShowDialog();
 }