C# BindingSource不向表中添加数据

我有一个表单，它必须向两个表中添加数据。 一个表包含讲师数据（姓名、姓氏、电话号码和教员id），另一个表包含登录数据（用户名、密码、isRoot属性，该属性说明讲师是否具有root权限）

为此，我制作了两个绑定源——一个用于讲师表，另一个用于登录数据表

首先，我向讲师表添加数据，然后支持向login_数据表添加数据，但事实并非如此。它只是将数据添加到讲师表中

我已经尝试过分别使用这些绑定源——它们可以工作，但是如果我尝试一个接一个地使用它们，第二个就不起作用了

代码：

讲师add（）是-

logindaadd（）是-

有人能帮忙吗？我做错了什么？项目必须在2小时内分配，我不知道该怎么做

public addLecturer(DataSet ds, adminForm frm)
        {
            InitializeComponent();
            attendanceRecording = ds;
            admForm = frm;

            string[] true_false = { "True", "False" };
            isRoot_cb.Items.AddRange(true_false);

            faculty_cb.DataSource = attendanceRecording.Tables["faculties"];
            faculty_cb.ValueMember = "faculty_id";
            faculty_cb.DisplayMember = "faculty_title";

            // Binding to lecturer table - lecturer_name, lecturer_surname, phone_number, faculty
            lecturer_bs = new BindingSource();
            lecturer_bs.DataSource = attendanceRecording;
            lecturer_bs.DataMember = "lecturers";
            lecturer_bs.AddNew();

            name_tb.DataBindings.Add(new Binding("text", lecturer_bs, "lecturer_name"));
            surname_tb.DataBindings.Add(new Binding("text", lecturer_bs, "lecturer_surname"));
            phoneNumber_tb.DataBindings.Add(new Binding("text", lecturer_bs, "phone_number"));
            facultyID_tb.DataBindings.Add(new Binding("text", lecturer_bs, "faculty_id"));

            // Binding to login_data table - lecturer_id, username, password, isroot
            loginData_bs = new BindingSource();
            loginData_bs.DataSource = attendanceRecording;
            loginData_bs.DataMember = "login_data";
            loginData_bs.AddNew();
            
            username_tb.DataBindings.Add(new Binding("text", loginData_bs, "login"));
            password_tb.DataBindings.Add(new Binding("text", loginData_bs, "password"));
            isRoot_cb.DataBindings.Add(new Binding("text", loginData_bs, "isroot"));
            lecturerID_tb.DataBindings.Add(new Binding("text", loginData_bs, "lecturer_id"));
        }

        private void addLecturer_btn_Click(object sender, EventArgs e)
        {
            string phoneNum = phoneNumber_tb.Text;
            GetFaculty = attendanceRecording.Tables["faculties"].Select($"faculty_title = '{faculty_cb.Text}'").FirstOrDefault();
            facultyID_tb.Text = GetFaculty["faculty_id"].ToString();
            lecturerAdd();
            GetLecturer = attendanceRecording.Tables["lecturers"].Select($"phone_number = {phoneNum}").FirstOrDefault();
            lecturerID = GetLecturer["lecturer_id"].ToString();
            lecturerID_tb.Text = lecturerID;
            loginDataAdd();
            ClearTB();
            this.Close();

private void lecturerAdd()
        {
            lecturer_bs.AddNew();
            admForm.UpdateData();
            admForm.ClearTables();
            admForm.FillTables();
        }

 private void loginDataAdd()
        {
            loginData_bs.AddNew();
            admForm.UpdateData();
            admForm.ClearTables();
            admForm.FillTables();
            admForm.ColumnInit();
        }