loading mysql to datagridview, datagridview became double

Question

Hi,

   I am using mysql and datagridview for storing and retrieving purpose., I just done saving the data from datagridview to mysql. But while I'm loading mysql into again that same datagridview, the datagridview become twice.

I given the code below

private void btnload_Click(object sender, EventArgs e)

        {

            DataTable dt = new DataTable();

            string st = "select * from searchsong";

            MySqlDataAdapter ad = new MySqlDataAdapter(st, con);

            MySqlCommandBuilder cmd = new MySqlCommandBuilder(ad);

            ad.Fill(dt);

            BindingSource bg = new BindingSource();

            bg.DataSource = dt;

            dataGridView1.DataSource = bg;

           

        }

In this "con"- connection string and "searchsong" is table name.