About Binding Navigator in windows application

Question

 public partial class Form2 : Form
    {
        BindingNavigator bnnav = new BindingNavigator(true);
        BindingSource bsource = new BindingSource();
        TextBox txt = new TextBox();
        public Form2()
        {
            InitializeComponent();
            this.bnnav.BindingSource=this.bsource;
            this.bnnav.Dock = DockStyle.Top;
            this.Controls.Add(this.bnnav);
            this.txt.Dock = DockStyle.Bottom;
            this.Controls.Add(txt);
            this.Size = new Size(800,200);
            this.Load += new EventHandler(Form2_Load);
           
        }

        private void Form2_Load(object sender, EventArgs e)
        {
            string constrg = "Data Source=srikanth;Initial Catalog=worktoworker;Integrated Security=True";
            SqlConnection con = new SqlConnection(constrg);
            SqlDataAdapter da = new SqlDataAdapter("Select * from customer",con);
            DataSet ds = new DataSet("Work2Work customers");
            ds.Tables.Add("customer");
            da.Fill(ds.Tables["customer"]);
            bsource.DataSource = ds.Tables["customer"];
            txt.DataBindings.Add(new Binding("Text",bsource,"Name",true));
           
        }
    }
For this line i am getting exception  which is

This causes two bindings in the collection to bind to the same property.
Parameter name: binding
how can i resolve it