using System;
using System.Security;

public class Example
{
   public static void Main()
   {
      char[] chars = { 't', 'e', 's', 't' };
      // Instantiate the secure string.
      SecureString testString = new SecureString();
      // Assign the character array to the secure string.
      foreach (char ch in chars)
         testString.AppendChar(ch);      
      // Display secure string length.
      Console.WriteLine("The length of the string is {0} characters.", testString.Length);

   }
}

   
     

   
  


using System;
using System.Security;
using System.Diagnostics;

class MainClass {
    public static SecureString ReadString() {
        SecureString str = new SecureString();
        ConsoleKeyInfo nextChar = Console.ReadKey(true);
        while (nextChar.Key != ConsoleKey.Enter) {
            if (nextChar.Key == ConsoleKey.Backspace) {
                if (str.Length > 0) {
                    str.RemoveAt(str.Length - 1);
                    Console.Write(nextChar.KeyChar+" " +nextChar.KeyChar);
                } else {
                    Console.Beep();
                }
            } else {
                str.AppendChar(nextChar.KeyChar);
                Console.Write("*");
            }

            nextChar = Console.ReadKey(true);
        }
        str.MakeReadOnly();
        return str;
    }

    public static void Main() {
        string user = "user1";
        Console.Write("Enter the user's password: ");
        using (SecureString pword = ReadString()) {
            ProcessStartInfo startInfo = new ProcessStartInfo();
            startInfo.FileName = "notepad.exe";
            startInfo.UserName = user;
            startInfo.Password = pword;
            startInfo.UseShellExecute = false;
            using (Process process = new Process()) {
                process.StartInfo = startInfo;
                try {
                    process.Start();
                } catch (Exception ex) {
                    Console.WriteLine("

Could not start Notepad process.");
                    Console.WriteLine(ex);
                }
            }
        }
    }
}

   
     

   



using System;
using Microsoft.Win32;
using System.Security.Permissions;

class Class1 {
    static void Main(string[] args) {

        RegistryPermission regPermission = new RegistryPermission(RegistryPermissionAccess.AllAccess, "HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersion");
        regPermission.Demand();


        RegistryKey myRegKey = Registry.LocalMachine;
        myRegKey = myRegKey.OpenSubKey("SOFTWAREMicrosoftWindows NTCurrentVersion");

        Object oValue = myRegKey.GetValue("RegisteredOwner");
        Console.WriteLine("OS Registered Owner: {0}", oValue.ToString());

    }
}

           
          

   


using System;
using Microsoft.Win32;
using System.Security.Permissions;

class Class1 {
    static void Main(string[] args) {
        RegistryPermission regPermission = new RegistryPermission(RegistryPermissionAccess.AllAccess, "HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersion");
        regPermission.Deny();


        RegistryKey myRegKey = Registry.LocalMachine;
        myRegKey = myRegKey.OpenSubKey("SOFTWAREMicrosoftWindows NTCurrentVersion");
        Object oValue = myRegKey.GetValue("RegisteredOwner");
        Console.WriteLine("OS Registered Owner: {0}", oValue.ToString());
    }
}

           
          

   
 
using System;
using System.Security;
using System.Security.Principal;
using System.Security.Permissions;


class Class1 {
    static void Main(string[] args) {
        //AppDomain.CurrentDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal);
        WindowsIdentity wi = WindowsIdentity.GetCurrent();
        PrincipalPermission PrincipalPerm = new PrincipalPermission(wi.Name, "Administrator");

        try {
            PrincipalPerm.Demand();
            Console.WriteLine("Code demand for an administrator succeeded.");
        } catch (SecurityException e) {
            Console.WriteLine("Demand for administrator failed!");
            Console.WriteLine(e.Message);
        }
    }
}

    

   
 

using System;
using System.Security.Permissions;

class MainClass {


    public static void Method2() {
        PrincipalPermission perm1 = new PrincipalPermission(null, @"MACHINEManagers");

        PrincipalPermission perm2 = new PrincipalPermission(null, @"MACHINEDevelopers");

        perm1.Union(perm2).Demand();
    }

    public static void Method3() {
        PrincipalPermission perm = new PrincipalPermission(@"MACHINETester", @"MACHINEManagers");
        perm.Demand();
    }
    [PrincipalPermission(SecurityAction.Demand, Name = @"MACHINETester")]
    public static void Method4() {
    }

    [PrincipalPermission(SecurityAction.Demand, Role = @"MACHINEManagers")]
    [PrincipalPermission(SecurityAction.Demand, Role = @"MACHINEDevelopers")]
    public static void Method5() {
        // Method implementation. . .
    }
    [PrincipalPermission(SecurityAction.Demand, Name = @"MACHINETester",
        Role = @"MACHINEManagers")]
    public static void Method6() {
        // Method implementation. . .
    }
}

    

   
 
using System;
using System.Security.Permissions;

class MainClass {

    public static void Method1() {
        PrincipalPermission perm = new PrincipalPermission(@"MACHINETester", null);
        perm.Demand();
    }


}