C# 通过DataSet 获取SQL 存储过程返回的多个结果集（tables）

IF EXISTS (SELECT 1 FROM SYSOBJECTS WHERE id = object_id (‘pr_test‘))
   DROP PROCEDURE pr_test
go

CREATE PROCEDURE pr_test
AS
SELECT TOP 4 * FROM Customers

SELECT TOP 4  * FROM Employees
GO

EXEC pr_test

using System;
using System.Data;
using System.Data.SqlClient;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string connStr = "Data Source=.;Initial Catalog=Northwind;User ID=sa;Password=root";
            SqlConnection conn = null;
            conn = new SqlConnection(connStr);
            conn.Open();
            string sql = "exec pr_test";
            SqlDataAdapter sda = new SqlDataAdapter(sql, conn);
            DataSet ds = new DataSet();
            sda.Fill(ds);    
            DataTable dt_customer = ds.Tables[0];
            DataTable dt_employee = ds.Tables[1];
            Console.WriteLine(dt_customer.Rows.Count);

        }
    }
}