Form1.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System.Net;
using System.Diagnostics;
//www.51aspx.com
namespace PressureTest
{
    public partial class Form1 : Form
    {
        private long _totalTimeCost = 0;
        private int _endedConnenctionCount = 0;
        private int _failedConnectionCount = 0;
        private int _connectionCount = 0;
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            button1.Enabled = false;
            var url = this.textBox1.Text;
            if (string.IsNullOrEmpty(url))
            {
                MessageBox.Show("URL不能为空！");
                return;
            }
            int connectionCount = 0;
            if (!int.TryParse(this.textBox2.Text, out connectionCount))
            {
                MessageBox.Show("Connection Count不合法！");
                return;
            }
            myProcessBar1.Task = this.ProgressTask;
            myProcessBar1.Run();
            this._connectionCount = connectionCount;
            label3.Text = " Please Wait...";
            Thread requestThread = new Thread(() => StartRequest(url, connectionCount));
            requestThread.IsBackground = true;
            requestThread.Start();
            
        }

        private void StartRequest(string url,int connectionCount)
        {

            //ThreadPool.SetMaxThreads(connectionCount * 2, 0);
            //Thread[] threads = new Thread[connectionCount];
            
            for (int i = 0; i < connectionCount; i++)
            {
                var request = HttpWebRequest.Create(url) as HttpWebRequest;
                request.ContentType = "application/x-www-form-urlencoded";