C# - Update Datagridview to database error ครับ ช่วยทีครับ

SqlDataAdapter sda;
         DataSet datas = new DataSet();
         DataTable dt;
         SqlCommandBuilder sqlb;

private void button2_Click(object sender, EventArgs e)
        {
            string connectionString;
            datas = new DataSet();
            connectionString = "Server=localhost;User Id=root; Password=1234; Database=db2; Pooling=false;CharSet=tis620;";
            connection = new MySqlConnection(connectionString);
            MySqlCommand cmd = new MySqlCommand("Select * from data Where Id = '"+comp.Text.Trim()+"'",connection);
            MySqlDataAdapter sda = new MySqlDataAdapter();
            sda.SelectCommand = cmd;
            DataTable dt = new DataTable();
            sda.Fill(dt);
            BindingSource bs = new BindingSource();
            bs.DataSource = dt;
           Table1.DataSource = bs;
            sda.Update(dt);
        }

private void button3_Click(object sender, EventArgs e)
        {
            
            sqlb = new SqlCommandBuilder(sda);

            sda.Fill(datas, "data");
            
        }