SqlDataAdapter和SqlCommandBuilder添加数据

using System;  
using System.Data;  
using System.Data.SqlClient;  
  
//SqlDataAdapter网站：http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqldataadapter.aspx  
//SqlCommandBuilder网站：http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommandbuilder.aspx  
namespace Chapter13  
{  
    class PersistAddsBuilder  
    {  
        static void Main(string[] args)  
        {  
            // connection string  
            string connString = @"  
            server = .;  
            integrated security = true;  
            database = northwind  
         ";  
  
            // query  
            string qry = @"  
            select  
               *  
            from  
               employees  
            where  
               country = 'UK'  
         ";  
  
            // create connection  
            SqlConnection conn = new SqlConnection(connString);  
  
            try  
            {  
                // create data adapter  
                SqlDataAdapter da = new SqlDataAdapter();  
                da.SelectCommand = new SqlCommand(qry, conn);  
  
                // create command builder  
                SqlCommandBuilder cb = new SqlCommandBuilder(da);  
  
                // create and fill dataset  
                DataSet ds = new DataSet();  
                da.Fill(ds, "employees");  
  
                // get data table reference  
                DataTable dt = ds.Tables["employees"];  
  
                // add a row  
                DataRow newRow = dt.NewRow();  
                newRow["firstname"] = "Roy";  
                newRow["lastname"] = "Beatty";  
                newRow["titleofcourtesy"] = "Sir";  
                newRow["city"] = "Birmingham";  
                newRow["country"] = "UK";  
                dt.Rows.Add(newRow);  
  
                // display rows  
                foreach (DataRow row in dt.Rows)  
                {  
                    Console.WriteLine(  
                       "{0} {1} {2}",  
                       row["firstname"].ToString().PadRight(15),  
                       row["lastname"].ToString().PadLeft(25),  
                       row["city"]);  
                }  
  
                // insert employees  
                da.Update(ds, "employees");  
            }  
            catch (Exception e)  
            {  
                Console.WriteLine("Error: " + e);  
            }  
            finally  
            {  
                // close connection  
                conn.Close();  
            }  
        }  
    }  
}