private void 添加图书馆ToolStripMenuItem_Click(object sender, EventArgs e)
 {
     frmAddLib fm = new frmAddLib();
     fm.ShowDialog();
     fm.Close();
 }
 private void button2_Click(object sender, EventArgs e)
 {
     frmAddLib fm = new frmAddLib();
     this.Close();
 }