ADO:DataSet合并两张表( ds.Merge(ds1))

原文发布时间为：2008-08-01 —— 来源于本人的百度文章 [由搬家工具导入]

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

using System.Data.SqlClient;

public partial class dataset2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if(!IsPostBack)
        {
        SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["pubsConn"].ConnectionString);
        SqlDataAdapter sda = new SqlDataAdapter();
        sda.SelectCommand = new SqlCommand("select title_id,title,type from titles", conn);
        DataSet ds = new DataSet();
        sda.Fill(ds, "t1");

        UniqueConstraint uc = new UniqueConstraint("pk", ds.Tables["t1"].Columns["title_id"], true);
        ds.Tables["t1"].Constraints.Add(uc);//表必须设主键，不然会直接合并到表的下面

        DataSet ds1 = new DataSet();
        sda.SelectCommand=new SqlCommand("select title_id,ord_num from sales",conn);
        sda.Fill(ds1,"t1");

      　Session["ds"]=ds;
        Session["ds1"]=ds1;

        GridView1.DataSource=ds.Tables["t1"];
        GridView1.DataBind();
    
        GridView2.DataSource=ds1.Tables["t1"];
        GridView2.DataBind();
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        DataSet ds = (DataSet)Session["ds"];
        DataSet ds1 = (DataSet)Session["ds1"];

       ds.Merge(ds1);//合并

        GridView3.DataSource = ds.Tables["t1"];
        GridView3.DataBind();       
    }
}