private void btInsert_Click(object sender, EventArgs e)
        {
            if (tbName.TextLength == 0)
            {
                MessageBox.Show("请输入姓名!");
                return;
            }

            int department = db.GetDepartmentID(cbDepartment.Text);

            if (db.InsertStaff(tbName.Text, cbSex.Text, int.Parse(numAge.Value.ToString()), tbPhoneNumber.Text, department) != 0)
            {
                fsm.FormStaffManager_Load(sender, e);
                this.Close();
                return;
            }
            MessageBox.Show("添加失败!");
        }