c#动态调用WebService

Code
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;

using System.Text;
using System.Windows.Forms;

namespace WindowsApplication1
{
public partial class Form1 : Form
{
private string _url = "http://www.baidu.com";
public Form1()
{
InitializeComponent();
init_Data();
}

public void init_Data()
{
WindowsServiceWebDefaultHotCity.WebServiceAgent agent = new WindowsServiceWebDefaultHotCity.WebServiceAgent(_url);
object[] args = new object[6];
args[0] = "PEK";
args[1] = "CAN";
args[2] = "";
args[3] = "2008-08-02";
args[4] = "00:00";
args[5] = "own_9588";
string text=agent.Invoke("GetAllFlight", args).ToString();
textBox1.Text = text;
}
}
}