两个DataTablel用Linq实现主外键查询

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;

namespace WebApplication2
{
    public partial class TwoDataTableJoin : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            DataTable dt1 = new DataTable();
            dt1.Columns.Add("id");
            dt1.Columns.Add("name");
            DataRow dr1=dt1.NewRow();
            dr1["id"] = "A01";
            dr1["name"] = "apple";
            dt1.Rows.Add(dr1);
            dr1 = dt1.NewRow();
            dr1["id"] = "A02";
            dr1["name"] = "bananer";
            dt1.Rows.Add(dr1);

            DataTable dt2 = new DataTable();

            dt2.Columns.Add("id");
            dt2.Columns.Add("QTY");
            DataRow dr2 = dt2.NewRow();
            dr2["id"] = "A01";
            dr2["QTY"] = "100";
            dt2.Rows.Add(dr2);
            dr2 = dt2.NewRow();
            dr2["id"] = "A02";
            dr2["QTY"] = "200";
            dt2.Rows.Add(dr2);

            DataTable dtReslut = new DataTable();
            dtReslut.Columns.Add("id");
            dtReslut.Columns.Add("name");
            dtReslut.Columns.Add("QTY");

            var result = (from t1 in dt1.AsEnumerable()
                          join t2 in dt2.AsEnumerable() on t1.Field<string>("id") equals t2.Field<string>("id")
                          select new
                          {
                              id = t1.Field<string>("id"),
                              Name = t1.Field<string>("Name"),
                              QTY = t2.Field<string>("QTY")
                          });
 
             foreach (var item in result) 
            {
                DataRow dr = dtReslut.NewRow();
                dr["id"] = item.id;
                dr["name"] = item.Name;
                dr["QTY"] = item.QTY;
                dtReslut.Rows.Add(dr);
            } 

        }
       
    }
}