Сохранение данных из datagridview в базу данных под MS sql server 2012

        private void Rreg_Click(object sender, EventArgs e)
        {
            SqlConnection cn = new SqlConnection(global::medical_Center.Properties.Settings.Default.medicConnectionString);
            try
            {
                string sql = "INSERT INTO authentication (ID,Login,Password) values (" + 25 + "," + 2555 + "," + 0454 + ")";
                SqlCommand exesql = new SqlCommand(sql, cn);
                cn.Open();
                exesql.ExecuteNonQuery();
                MessageBox.Show("add new record");
                this.authenticationTableAdapter.Fill(this.medicDataSet.authentication);
            }
            catch (Exception)
            {
                MessageBox.Show("error");
            }
            
        }

private void SaveButton_Click(object sender, EventArgs e)
        {
            SqlCommandBuilder MyCommandBuilder = new SqlCommandBuilder(MyDataAdapter);
            MyDataAdapter.UpdateCommand = MyCommandBuilder.GetUpdateCommand(true);
            //MydataAdapter.Update((DataTable)MyBindingSorce.DataSource); // или так
        }

private void MainForm_Load(object sender, EventArgs e)
{
  BindingSource MyBindingSorce = new BindingSource();
  MyDataAdapter = new SqlDataAdapter("SELECT * FROM MyTable", MyConnectionString);
  DataTable MyDataTable = new DataTable();
  MyDataAdapter.Fill(MyDataTable);
  MyBindingSorce.DataSource = MyDataTable;
}