C reads the registry

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using Microsoft.Win32;

public partial class Register : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Response.Write(" Here is the information read "+"<br/>");
        ReadRegedit();
        Response.Write("<br/>");
        Response.Write(" The information to be written here swort/swort-test" + "<br/>");
        WriteRegedit();
        Response.Write(" End of write " + "<br/>");

        Response.Write(" Check whether it exists " + "<br/>");
        ExistsRegedit();
        Response.Write(" End of view " + "<br/>");
        Response.Write(" Delete " + "<br/>");
        DeleteRegedit();
        Response.Write(" Delete end " + "<br/>");
        Response.Write(" Check whether it exists " + "<br/>");
        ExistsRegedit();
        Response.Write(" End of view " + "<br/>");
    }
    /// <summary>
    /// Reading of registry
    /// </summary>
    /// <returns></returns>
    public void ReadRegedit()
    {
        RegistryKey rk = Registry.CurrentUser;
        RegistryKey softWare = rk.OpenSubKey("Software");
        RegistryKey microsoft = softWare.OpenSubKey("Microsoft");   
        RegistryKey windows = microsoft.OpenSubKey("Windows");
        RegistryKey current = windows.OpenSubKey("CurrentVersion");
        RegistryKey explorer = current.OpenSubKey("Explorer");
        RegistryKey shell = explorer.OpenSubKey(@"Shell Folders");

        foreach (string b in shell.GetValueNames())// Here we use shell.GetValueNames() No shell.GetSubKeyNames()
        {
            Response.Write( b+"            "+ shell.GetValue(b).ToString());
            Response.Write("<br/>");
              
        }
       
   
    }
    /// <summary>
    /// Write to the registry
    /// </summary>
    /// <returns></returns>
    public bool WriteRegedit()
    {
        try
        {
            RegistryKey rk = Registry.CurrentUser;
            RegistryKey softWare = rk.OpenSubKey("Software");
            RegistryKey microsoft = softWare.OpenSubKey("Microsoft");
            RegistryKey windows = microsoft.OpenSubKey("Windows");
            RegistryKey current = windows.OpenSubKey("CurrentVersion");
            RegistryKey explorer = current.OpenSubKey("Explorer");
            RegistryKey shell = explorer.OpenSubKey(@"Shell Folders", true);// It has to be added here true Is to get write permission
            RegistryKey key = shell.CreateSubKey("swort");// establish swort Catalog

            key.SetValue("swort", "test");
            // stay swort Create a write directory swort test
            Response.Write(" Write successfully ！！！！！！！！！");
            return true;
        }
        catch
        {
            return false;

        }

    }
    /// <summary>
    /// Deletion of registry
    /// </summary>
    /// <returns></returns>
    public bool DeleteRegedit()
    {
        try
        {
            RegistryKey rk = Registry.CurrentUser;
            RegistryKey softWare = rk.OpenSubKey("Software");
            RegistryKey microsoft = softWare.OpenSubKey("Microsoft");
            RegistryKey windows = microsoft.OpenSubKey("Windows");
            RegistryKey current = windows.OpenSubKey("CurrentVersion");
            RegistryKey explorer = current.OpenSubKey("Explorer");
            RegistryKey shell = explorer.OpenSubKey(@"Shell Folders",true);
            RegistryKey swort = shell.OpenSubKey("swort",true);// It has to be added here true Is to get write permission
            swort.DeleteValue("swort");// Delete swort Value    This key value is deleted together There's one left
            shell.DeleteSubKey("swort",false);// Delete swort This directory    To delete this directory Must have permission
           
            Response.Write(" Delete successful ！！！！！！！！！");
            return true;
        }
        catch
        {
            return false;

        }
        return true;

    }
    /// <summary>
    /// Query whether a key value exists
    /// </summary>
    /// <returns></returns>
    public bool ExistsRegedit()
    {
        RegistryKey rk = Registry.CurrentUser;
        RegistryKey softWare = rk.OpenSubKey("Software");
        RegistryKey microsoft = softWare.OpenSubKey("Microsoft");
        RegistryKey windows = microsoft.OpenSubKey("Windows");
        RegistryKey current = windows.OpenSubKey("CurrentVersion");
        RegistryKey explorer = current.OpenSubKey("Explorer");
        RegistryKey shell = explorer.OpenSubKey(@"Shell Folders");
        if (shell.SubKeyCount != 0)
        {
            RegistryKey swort = shell.OpenSubKey("swort");
            foreach (string b in swort.GetValueNames())
            {

                if (b == "swort")
                {
                    Response.Write(" There is this key ！");
                    return true;
                }

            }
            Response.Write(" There is no such key ！");
            return false;
        }
        else

        { Response.Write(" There is no such key ！");
        return false;
        }

    }
}