执行带参数的存储过程

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SqlClient;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            SqlConnection conn = new SqlConnection("Server=zhuobin;uid=sa;pwd=zhuobin;database=Northwind");
            try
            {
                conn.Open();
                SqlCommand cmd = conn.CreateCommand();
                cmd.CommandText = "sp_orderbyid";
                cmd.CommandType = CommandType.StoredProcedure;
                SqlParameter employeeid = new SqlParameter();
                employeeid.ParameterName = "@employeeid";
                employeeid.SqlDbType=SqlDbType.Int;
                employeeid.Direction = ParameterDirection.Input;
                employeeid.Value = 2;
                cmd.Parameters.Add(employeeid);
                //
                SqlParameter outParm = new SqlParameter("@ordercount",SqlDbType.Int);
                outParm.Direction = ParameterDirection.Output;
                cmd.Parameters.Add(outParm);
                //
                SqlParameter retval = new SqlParameter();
                retval.ParameterName = "return_value";
                retval.SqlDbType = SqlDbType.Int;
                retval.Direction = ParameterDirection.ReturnValue;
                cmd.Parameters.Add(retval);
                SqlDataReader rdr = cmd.ExecuteReader();
                while (rdr.Read())
                {
                    Console.WriteLine("{0}{1}",rdr[0].ToString().PadRight(5),rdr[1].ToString());
                }
                rdr.Close();
                //Display the output parameter
                Console.WriteLine("The output Parameter value is {0}", cmd.Parameters["@ordercount"].Value);
                Console.WriteLine("The return value is {0}",cmd.Parameters["return_value"].Value);

            }
            catch (SqlException ex)
            {
                Console.WriteLine("Error:{0}", ex.Message);
            }
            finally
            {
                conn.Close();
            }
            Console.ReadLine();
        }
    }
}