The type or namespace name 'Form1' could not be found

[zhshqzyc]

It's very simple example. but...

using System;
using System.Collections.Generic;
using System.Windows.Forms;

    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());//here!!!!!!
            TestURL T = new TestURL();
            T.download();
        }
    }

using System;
class TestURL
{
        
    public void download()
    {
        CSDownloadURL web = new CSDownloadURL();
        string strOut;
        web.setURL1("http://www.google.com");
        web.DownloadURL(out strOut);
        Console.WriteLine(strOut);
    }
}

using System;
using System.Text;
using System.IO;
using System.Net;

public class CSDownloadURL
{
    private string m_strURL;
    public void setURL1(string strURL)
    {
        m_strURL = strURL;
    }

    public void DownloadURL(out string strContents)
    {
        WebRequest req = WebRequest.Create(m_strURL);
        WebResponse res = req.GetResponse();
        int iTotalBuff = 0;
        Byte[] Buffer = new Byte[128];
        Stream stream = res.GetResponseStream();
        iTotalBuff = stream.Read(Buffer, 0, 128);
        StringBuilder strRes = new StringBuilder("");
        while (iTotalBuff != 0)
        {
            strRes.Append(Encoding.ASCII.GetString(Buffer, 0, iTotalBuff));
            iTotalBuff = stream.Read(Buffer, 0, 128);
        }
        strContents = strRes.ToString();
    }
}

Thanks for your help