asp.net中同时查询两个数据库表进行联合查询

 using System;

   using System.Collections.Generic;

   using System.ComponentModel;

    using System.Data;

    using System.Drawing;

    using System.Text;

     using System.Windows.Forms;

    using System.Data.SqlClient;

    using System.Linq;

  namespace LinkTwoData

    {

      public partial class Form1 : Form

        {

          public Form1()

          {

               InitializeComponent();

          }

          string strcon1 = @"Data Source=FENG-PCSQLEXPRESS;Initial Catalog=test1;User ID=sa;PassWord=sa2008";

           string strcon2 = @"Data Source=FENG-PCSQLEXPRESS;Initial Catalog=test2;User ID=sa;PassWord=sa2008";

          private void Form1_Load(object sender, EventArgs e)

         {

               SqlDataAdapter sda1 = new SqlDataAdapter("select * from stu1",strcon1);

               SqlDataAdapter sda2 = new SqlDataAdapter("select * from stu1", strcon2);

             DataSet ds = new DataSet();

              sda1.Fill(ds,"stu1");

              sda2.Fill(ds, "stu2");

             var query = from stu in ds.Tables["stu1"].AsEnumerable()

                         from sc in ds.Tables["stu2"].AsEnumerable()

                          where stu.Field("sc") == sc.Field("sc")

                         select new

                         {

                              sno = stu.Field("sno",DataRowVersion.Original),

                              sname=stu.Field("sname",DataRowVersion.Original),

                              sage = stu.Field("sage", DataRowVersion.Original),

                              scname = sc.Field("scname", DataRowVersion.Original)

                          };

              DataTable dt = new DataTable();

              dt.Columns.Add("sno", typeof(int));

              dt.Columns.Add("sname", typeof(string));

               dt.Columns.Add("sage", typeof(string));

               dt.Columns.Add("scname", typeof(string));

             foreach (var item in query)

              {

                 DataRow newRow = dt.NewRow();

                    newRow["sno"] = item.sno;

                  newRow["sname"] = item.sname;

                   newRow["sage"] = item.sage;

                  newRow["scname"] = item.scname;

                   dt.Rows.Add(newRow);

            }

             dataGridView1.DataSource = dt.DefaultView;

         }

      }
  }