private void btnRefresh_Click(object sender, EventArgs e)
{
        string connection = "server=localhost;database=teste_etb;user=root;password=******";
              MySqlConnection con = new MySqlConnection(connection);
              con.Open();
              MySqlCommand command = new MySqlCommand();
              command.Connection = con;
              MySqlDataAdapter MyDA = new MySqlDataAdapter();
              sqlSelectAll = "SELECT * from conteudos";
              MyDA.SelectCommand = new MySqlCommand(sqlSelectAll, con);
              DataTable table = new DataTable();
              MyDA.Fill(table);
              BindingSource bSource = new BindingSource();
              bSource.DataSource = table;
              dataGridView1.DataSource = bSource;
              con.Close();
}

 private void txtSearch_TextChanged(object sender, EventArgs e)
 {

        DataView dv = new DataView(table);
        dv.RowFilter = string.Format("Nome LIKE '%{0}'");
       dataGridView1.DataSource = dv;


 }