关于编程（C#）的问题！高手请进！

我想写一个小程序（WindowsFormsApplication 程序） 程序里面有一个下载按钮 我想通过这个下载按钮直接在网上下载我指定地址的东西！比如说下载软件呀,电影呀！等等！问题是那个下载按钮里面该写什么代码！尽量清晰一点！（自己写一个类似的给我也行【可以把原文件发给我参考】）是高手就帮帮我吧！在此先谢过啦！符合要求且行的通的在酌情加分！

追问：非常感谢你的回答！可否将那个小程序的源文件发给我！目前我还不知道结果测试是怎么样的！等我测试完了！我想办法给你加分哦！

答案：using System; 
  using System.Drawing; 
  using System.Collections; 
  using System.ComponentModel; 
  using System.Windows.Forms; 
  using System.Data; 
  using System.Net; 
  using System.IO; 
  using System.Threading; 
   
  namespace MyGetCar 
  { 
  /// 
  /// Form1 的摘要说明。 
  /// 
  public class Form1 : System.Windows.Forms.Form 
  { 
  private System.Windows.Forms.Label label1; 
  private System.Windows.Forms.Label label2; 
  private System.Windows.Forms.TextBox srcAddress; 
  private System.Windows.Forms.TextBox tarAddress; 
  private System.Windows.Forms.Button Start; 
   
  private WebClient client = new WebClient(); 
   
  /// 
  /// 必需的设计器变量。 
  /// 
  private System.ComponentModel.Container components = null; 
   
  public Form1() 
  { 
  // 
  // Windows 窗体设计器支持所必需的 
  // 
  InitializeComponent(); 
   
  // 
  // TODO: 在 InitializeComponent 调用后添加任何构造函数代码 
  // 
  } 
   
  /// 
  /// 清理所有正在使用的资源。 
  /// 
  protected override void Dispose( bool disposing ) 
  { 
  if( disposing ) 
  { 
  if (components != null) 
  { 
  components.Dispose(); 
  } 
  } 
  base.Dispose( disposing ); 
  } 
   
  #region Windows Form Designer generated code 
  /// 
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改 
  /// 此方法的内容。 
  /// 
  private void InitializeComponent() 
  {
      this.label1 = new System.Windows.Forms.Label();
      this.label2 = new System.Windows.Forms.Label();
      this.srcAddress = new System.Windows.Forms.TextBox();
      this.tarAddress = new System.Windows.Forms.TextBox();
      this.Start = new System.Windows.Forms.Button();
      this.SuspendLayout();
      // 
      // label1
      // 
      this.label1.Location = new System.Drawing.Point(7, 30);
      this.label1.Name = "label1";
      this.label1.Size = new System.Drawing.Size(60, 21);
      this.label1.TabIndex = 0;
      this.label1.Text = "文件地址：";
      this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
      // 
      // label2
      // 
      this.label2.Location = new System.Drawing.Point(7, 67);
      this.label2.Name = "label2";
      this.label2.Size = new System.Drawing.Size(60, 21);
      this.label2.TabIndex = 1;
      this.label2.Text = "另存到：";
      this.label2.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
      // 
      // srcAddress
      // 
      this.srcAddress.Location = new System.Drawing.Point(67, 30);
      this.srcAddress.Name = "srcAddress";
      this.srcAddress.Size = new System.Drawing.Size(180, 20);
      this.srcAddress.TabIndex = 2;
      // 
      // tarAddress
      // 
      this.tarAddress.Location = new System.Drawing.Point(67, 67);
      this.tarAddress.Name = "tarAddress";
      this.tarAddress.Size = new System.Drawing.Size(180, 20);
      this.tarAddress.TabIndex = 3;
      // 
      // Start
      // 
      this.Start.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
      this.Start.Location = new System.Drawing.Point(180, 104);
      this.Start.Name = "Start";
      this.Start.Size = new System.Drawing.Size(62, 22);
      this.Start.TabIndex = 5;
      this.Start.Text = "开始下载";
      this.Start.Click += new System.EventHandler(this.Start_Click);
      // 
      // Form1
      // 
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(312, 173);
      this.Controls.Add(this.Start);
      this.Controls.Add(this.tarAddress);
      this.Controls.Add(this.srcAddress);
      this.Controls.Add(this.label2);
      this.Controls.Add(this.label1);
      this.MaximizeBox = false;
      this.Name = "Form1";
      this.Text = "文件下载器";
      this.ResumeLayout(false);
      this.PerformLayout();
  } 
  #endregion 
   
  /// 
  /// 应用程序的主入口点。 
  /// 
  [STAThread] 
  static void Main() 
  { 
  Application.Run(new Form1()); 
  } 
   
  private void StartDownload() 
  { 
  string URL = srcAddress.Text; 
  int n = URL.LastIndexOf("/"); 
  string URLAddress = URL.Substring(0,n); 
  string fileName = URL.Substring(n+1,URL.Length-n-1); 
  string Dir = tarAddress.Text; 
  string Path = Dir+"\\"+fileName; 
   
  try 
  { 
  WebRequest myre=WebRequest.Create(URLAddress); 
  } 
  catch(WebException exp) 
  { 
  MessageBox.Show(exp.Message,"Error"); 
  } 
   
  try 
  { 
  client.DownloadFile(URLAddress,fileName); 
  Stream str = client.OpenRead(URLAddress); 
  StreamReader reader = new StreamReader(str); 
  byte[] mbyte = new byte[100000]; 
  int allmybyte = (int)mbyte.Length; 
  int startmbyte = 0; 
  while(allmybyte>0) 
  { 
  int m = str.Read(mbyte,startmbyte,allmybyte); 
  if(m==0) 
  break; 
   
  startmbyte+=m; 
  allmybyte-=m; 
  } 
   
  FileStream fstr = new FileStream(Path,FileMode.OpenOrCreate,FileAccess.Write); 
  fstr.Write(mbyte,0,startmbyte); 
  str.Close(); 
  fstr.Close(); 
   
  } 
  catch(WebException exp) 
  { 
  MessageBox.Show(exp.Message,"Error"); 
  } 
   
  Start.Enabled = true; 
  } 
   
   
  private void Start_Click(object sender, System.EventArgs e) 
  { 
  Thread th = new Thread(new ThreadStart(StartDownload)); 
  th.Start(); 
  } 
  } 
  }      
 
vs2008测试成功

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