como importar dados do banco de dados mysql para datagridview

string connectionString = ""; //Set your MySQL connection string here.
string query =""; // set query to fetch data "Select * from  tabelname"; 
using(MySqlConnection conn = new MySqlConnection(connStr))
{
    using(MySqlDataAdapter adapter = new MySqlDataAdapter(query, conn))
    {
        DataSet ds = new DataSet();
        adapter.Fill(ds);
        DataGridView1.DataSource= ds.Tables[0];
    }
}