using (SqlConnection conn = new SqlConnection("server=(local);database=Northwind;user id=sa;password=sa;min pool size=4;max pool size=100;Connection Lifetime=30;"))
{
    //创建两个DataTable

    SqlDataAdapter adapter1 = new SqlDataAdapter("Select Top 10 * FROM Products", conn);
    DataTable table1 = new DataTable();
    adapter1.Fill(table1);

    SqlDataAdapter adapter2 = new SqlDataAdapter("Select Top 10 * FROM Products order By productid Desc", conn);
    DataTable table2 = new DataTable();
    adapter2.Fill(table2);

    //创建一个新的DataTable并加载前面两个DataTable数据
    DataTable table = new DataTable();
    table.Load(table1.CreateDataReader());
    table.Load(table2.CreateDataReader());

    //数据源绑定到GridView
    GridView1.DataSource = table.DefaultView;
    GridView1.DataBind();
}