C# implements online update software

using System;
using ;
using ;
using ;
using ;
using ;
using ;
using ;
using CCWin;
using ;
using ;
using ;
using ;
using ;
using ;
 
namespace WriteBook
{
  public partial class UpdateSoftwareForm : Skin_Metro
  {
    public UpdateSoftwareForm()
    {
      InitializeComponent();
    }
 
    #region Some objects and variables 
    //Use WebClient to download    WebClient client = new WebClient();
    ArrayList downlist = new ArrayList();
    //Current version    string nowversion = null;
    //Latest version    string latesversion = null;
 
    #endregion
 
    #region Get version number 
    /// <summary>
    /// Get the latest version number from the server    /// </summary>
    public void DownloadCheckUpdateXml()
    {
      try
      {
        //The first parameter is the address of the file, and the second parameter is the file name of the path saved by the file        ("/SoftwareDownload/WriteBook/", "");
      }
      catch
      {
        ("No update was detected.", "hint");
        ();
      }
    }
 
    /// <summary>
    /// Get the version number of the local software    /// </summary>
    private void NowVersion()
    {
      nowversion = ().GetName().() + "\n";
       = nowversion;
    }
 
    /// <summary>
    /// Read the latest version number obtained from the server    /// </summary>
    public void LatestVersion()
    {
      try
      {
        if ((""))
        {
          XmlDocument doc = new XmlDocument();
          //Load the XML to be read          ("");
 
          //Get the root node          XmlElement WriteBook = ;
 
          //Get child nodes Return the collection of nodes          XmlNodeList Update = ;
 
          foreach (XmlNode item in Update)
          {
            latesversion = ;
          }
           = latesversion;
        }
        else
        {
          ("No update was detected.", "hint");
          ();
        }
      }
      catch
      {
        ();
      }
    }
 
    #endregion
 
    #region Initializer 
    /// <summary>
    /// Initialize the program    /// </summary>
    private void InitializeandInstall()
    {
       = 20;
      DownloadCheckUpdateXml();
       = 40;
      NowVersion();
       = 60;
      LatestVersion();
       = 80;
      DownloadInstall();
       = 100;
    }
 
    #endregion
 
    #region Installation and Delete 
    /// <summary>
    /// Download the installation package    /// </summary>
    public void DownloadInstall()
    {
      try
      {
        if (nowversion == latesversion)
        {
          ("You are already the latest version.", "hint");
        }
        else if (nowversion != latesversion && (""))
        {
          ("New version is discovered, update patches will be downloaded soon.", "hint", , );
          ("/SoftwareDownload/WriteBook/", "");
          if ((""))
          {
            InstallandDelete();
          }
          else
          {
            for (int i = 1; i < 3; i++)
            {
              ("/SoftwareDownload/WriteBook/", "");
            }
            ("Download failed, please check if your network connection is normal.", "hint");
            ();
          }
        }
      }
      catch
      {
        ("Update failed, no new version was found.", "hint");
        ();
      }
    }
 
    /// <summary>
    /// Install and delete    /// </summary>
    private void InstallandDelete()
    {
      try
      {
        DialogResult dr = ("Download the update successfully, is it installed a new update?", "hint", );
        if (dr == )
        {
          //Start the installer          ("");
          Thread td = new Thread(JudgeInstall);
          ();
        }
        else { }
      }
      catch
      {
        ("An unknown error occurred and the update failed.", "hint");
        ();
      }
    }
 
    /// <summary>
    /// Determine whether the installation process exists    /// </summary>
    public void JudgeInstall()
    {
      while (true)
      {
        Process[] processList = ();
        foreach (Process process in processList)
        {
          if ( == "") { }
          else
          {
            DialogResult dr = ("The update was successful, did you delete the installation package?", "hint", );
            if (dr == )
            {
              ("");
              ("");
            }
          }
        }
      }
    }
 
    #endregion
 
    /// <summary>
    /// Click to initialize the program    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void UpdateButton_Click(object sender, EventArgs e)
    {
      InitializeandInstall();
    }
  }
}