C#

public void WhatAreTheDomains()
        {
            try
            {
                DomainCollection domains = Forest.GetCurrentForest().Domains;

                foreach (Domain domain in domains)
                {
                    //Console.WriteLine(domain.Name);
                    if (File.Exists(Environment.CurrentDirectory + "\\Debug.txt"))
                    {
                        MessageBox.Show("WhatAreTheDomains: " + domain.Name);
                    }
                    cboDomains.Items.Add(domain.Name);
                }
            }
            catch
            {
                ErrorLogWriter("We have a problem communicating with the AD");
            }
        }
            public void ShowDomainUsers()
        {
            //string path = "LDAP://xxxx/CN=Users,DC=firm,DC=xxxx,DC=com";
            string Path = "LDAP://" + cboDomains.Text + "/CN=Users,DC=" + Left(cboDomains.Text, (cboDomains.Text.IndexOf(".", 0))) + ",DC=" + Right(cboDomains.Text, (cboDomains.Text.Length - cboDomains.Text.IndexOf(".", 0) - 1));
            string Filter = "(&(objectCategory=person)(objectClass=user))";//(!userAccountControl:1.2.840.113556.1.4.803:=2))";
            string[] PropertiesToLoad = new string[2] { "name", "sAMAccountName" };

            //DirectoryEntry domain = new DirectoryEntry("LDAP://domain.com/CN=Users,DC=Domain,DC=com");
            //LDAP://PeerAssist.com/CN=Users,DC=PeerAssist,DC=com
            try
            {


                if (File.Exists(Environment.CurrentDirectory + "\\Debug.txt"))
                {
                    MessageBox.Show("ShowDomainUsers: LDAP://" + cboDomains.Text + "/CN=Users,DC=" + Left(cboDomains.Text, (cboDomains.Text.IndexOf(".", 0))) + ",DC=" + Right(cboDomains.Text, (cboDomains.Text.Length - cboDomains.Text.IndexOf(".", 0) - 1)));
                }
                using (DirectoryEntry domain = new DirectoryEntry("LDAP://" + cboDomains.Text + "/CN=Users,DC=" + Left(cboDomains.Text, (cboDomains.Text.IndexOf(".", 0))) + ",DC=" + Right(cboDomains.Text, (cboDomains.Text.Length - cboDomains.Text.IndexOf(".", 0) - 1))))
                using (DirectorySearcher searcher = new DirectorySearcher(domain, Filter, PropertiesToLoad))
                using (SearchResultCollection results = searcher.FindAll())
                {
                    foreach (SearchResult result in results)
                    {
                        string name = (string)result.Properties["name"][0];
                        string winuserlogon = (string)result.Properties["sAMAccountName"][0];

                        //MessageBox.Show(name);
                        //string name1 = (string)result.Properties["sAMAccountName"][1];
                        //MessageBox.Show(name1);

                        //OLD WAY
                        //lbxDomainUsers.Items.Add(name + " | " + winuserlogon);

                        DomainUsers = new DomainUsersClass();
                        DomainUsers.FullUserName = name;
                        DomainUsers.WindowsLogonName = winuserlogon;
                        DomainUsersArray.Add(DomainUsers);
                    }
                }

                for (i = 0; i < DomainUsersArray.Count; i++)
                {
                    lbxDomainUsers.Items.Add(((DomainUsersClass)DomainUsersArray[i]).WindowsLogonName);
                }
                
            }
            catch
            {
                MessageBox.Show("We are having a problem with the active directory.");
            }
        }

[ToolStripItemDesignerAvailability(ToolStripItemDesignerAvailability.All)]
public class NumericUpDownToolStipItem : ToolStripControlHost
{
    public NumericUpDownToolStipItem()
        : base(new NumericUpDown())
    {
    }
    public NumericUpDown NumericUpDown
    {
        get { return (NumericUpDown)Control; }
    }

    protected override void OnSubscribeControlEvents(Control c)
    {
        base.OnSubscribeControlEvents(c);
    }

    protected override void OnUnsubscribeControlEvents(Control c)
    {
        base.OnUnsubscribeControlEvents(c);
    }
}

<br />
--------<br />
PC1|AP1|<br />
--------<br />
AP2|AP1|<br />
--------<br />
RP1|PC4|<br />
--------<br />
AP2|PC4|<br />
--------

PC1-->AP1-->AP2-->PC4

public static bool EncryptFile(string inputFile, string outputFile)
		{
			PasswordDeriveBytes pdb = new PasswordDeriveBytes(fileEncryptionPassword, new System.Security.Cryptography.SHA384Managed().ComputeHash(new System.Text.UnicodeEncoding().GetBytes(fileEncryptionPassword)));
			byte[] key = pdb.GetBytes(32);
			byte[] IV = pdb.GetBytes(16);
			
			RijndaelManaged rm = new RijndaelManaged();
			rm.Key = key;
			rm.IV = IV;
			rm.BlockSize = 128;
			rm.Padding = PaddingMode.PKCS7;
			
			FileStream fsIn = new FileStream(inputFile, FileMode.Open, FileAccess.Read);
			FileStream fsOut = new FileStream(outputFile, FileMode.Create, FileAccess.Write);
			
			bool success = true;
			
			try{
				CryptoStream cs = new CryptoStream(fsOut, rm.CreateEncryptor(), CryptoStreamMode.Write);
				
				int bytesToWrite = 0;
				byte[] buffer = new byte[4096];
				
				while(true)
				{
					bytesToWrite = fsIn.Read(buffer, 0, buffer.Length);
					if(bytesToWrite == 0)
						break;
					cs.Write(buffer, 0, bytesToWrite);
				}
				
				cs.Close();
			}
			catch
			{
				success = false;
			}
			fsIn.Close();
			fsOut.Close();
			
			if(!success)
				File.Delete(outputFile);
			
			return success;
		}

public static bool DecryptFile(string inputFile, string outputFile)
		{
			PasswordDeriveBytes pdb = new PasswordDeriveBytes(fileEncryptionPassword, new System.Security.Cryptography.SHA384Managed().ComputeHash(new System.Text.UnicodeEncoding().GetBytes(fileEncryptionPassword)));
			byte[] key = pdb.GetBytes(32);
			byte[] IV = pdb.GetBytes(16);
			
			RijndaelManaged rm = new RijndaelManaged();
			
			rm.Key = key;
			rm.IV = IV;
			rm.BlockSize = 128;
			rm.Padding = PaddingMode.PKCS7;
			
			FileStream fsIn = new FileStream(inputFile, FileMode.Open, FileAccess.Read);
			FileStream fsOut = new FileStream(outputFile, FileMode.Create, FileAccess.Write);
			
			bool success = true;
			
			CryptoStream cs = new CryptoStream(fsIn, rm.CreateDecryptor(), CryptoStreamMode.Read);
			
			try{
				int bytesToWrite = 0;
				byte[] buffer = new byte[4096];
				
				while(true)
				{
					bytesToWrite = cs.Read(buffer, 0, buffer.Length);
					if(bytesToWrite == 0)
						break;
					fsOut.Write(buffer, 0, bytesToWrite);
				}
			}
			catch(Exception ex)
			{
				Debug.Show(ex.Message + "\n\n" + ex.StackTrace + "\n\n" + ex.InnerException.Message);
				success = false;
			}
			finally{
				cs.Close();
			}
			
			fsIn.Close();
			fsOut.Close();
			
			if(!success)
				File.Delete(outputFile);
			
			return success;
		}