c#如何合并两个数据库表格

                                                  表1.tb_1                                                                                          表2.tb_2

将表1和2合并

代码：

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        SqlConnection conn;
        private void Form1_Load(object sender, EventArgs e)
        {
            conn = new SqlConnection("server=.;database=k;uid=sa;pwd=123456");
            DataSet ds = new DataSet();
            DataSet ds1 = new DataSet();
            SqlDataAdapter sda = new SqlDataAdapter("select * from tb_1", conn);
            sda.Fill(ds);
            SqlDataAdapter sda1 = new SqlDataAdapter("select * from tb_2", conn);
            SqlCommandBuilder sbl = new SqlCommandBuilder(sda1);
            sda1.Fill(ds1);
            ds1.Merge(ds,true,MissingSchemaAction.AddWithKey);
            dataGridView1.DataSource = ds1.Tables[0];
        }