1.大批量数据操作

　　可以利用SqlBulkCopy类快速写入大批量数据，针对SQL Server的优化，可以写入DataRow数据，DataTable,DataReader

　　WriteToServer（DataTable）写入数据表

　　WriteToServer（DataRow[]）批次写入数据行

　　WriteToServer（DataTable ，DataRowState）按行状态写入数据库表

　　WriteToServer（IDataReader）写入DataReader对象

  string connstr = "server=(local);database=northwind;integrated security=true;async=true";
            // Fill up a DataSet
            DataSet ds = new DataSet();
            SqlConnection conn = new SqlConnection(connstr);
            SqlDataAdapter dadp = new SqlDataAdapter("select * from customers", conn);
            dadp.Fill(ds);
            // Copy the Data to SqlServer
            SqlBulkCopy bcp = new SqlBulkCopy(connstr);
            bcp.DestinationTableName = "customers1";
            bcp.WriteToServer(ds.Tables[0]);
　　2.多个动态的结果集

　　Multiple Active Result Sets（MARS）

　　这个只能在SQL Server 2005中使用

　　可以在一个Command对象上同时打开多个DataReader

 string connstr = "server=(local);database=northwind;integrated security=true;async=true";
            SqlConnection conn = new SqlConnection(connstr);
            conn.Open();
            SqlCommand cmd1 = new SqlCommand("select * from customers", conn);
            SqlCommand cmd2 = new SqlCommand("select * from orders", conn);
            SqlDataReader rdr1 = cmd1.ExecuteReader();
            // next statement causes an error PRior to SQL Server 2005
            SqlDataReader rdr2 = cmd2.ExecuteReader();
            // now you can reader from rdr1 and rdr2 at the same time.