Out Of Date Change UserName and Password

PasswordExpires, Part I 

public class PasswordExpires
{
  DomainPolicy policy;
  
  const int UF_DONT_EXPIRE_PASSWD = 0x10000;
 
  public PasswordExpires()
  {
    //get our current domain policy
    Domain domain = Domain.GetCurrentDomain();
    DirectoryEntry root = domain.GetDirectoryEntry();
  
    using (domain)
    using (root)
    {
      this.policy = new DomainPolicy(root);
    }
  }

 PasswordExpires, Part II

public DateTime GetExpiration(DirectoryEntry user)
  {
    int flags = 
      (int)user.Properties["userAccountControl"][0];
 
    //check to see if password is set to expire
    if(Convert.ToBoolean(flags & UF_DONT_EXPIRE_PASSWD))
    {
      //the user’s password will never expire
      return DateTime.MaxValue;
    }
 
    long ticks = GetInt64(user, "pwdLastSet");
 
    //user must change password at next login
    if (ticks == 0)
      return DateTime.MinValue;
 
    //password has never been set
    if (ticks == -1)
    {
      throw new InvalidOperationException(
        "User does not have a password"
        );
    }
 
    //get when the user last set their password;
    DateTime pwdLastSet = DateTime.FromFileTime(
      ticks
      );
 
    //use our policy class to determine when
    //it will expire
    return pwdLastSet.Add(
      this.policy.MaxPasswordAge
      );
  } 

 PasswordExpires, Part III 

public TimeSpan GetTimeLeft(DirectoryEntry user)
  {
    DateTime willExpire = GetExpiration(user);
 
    if (willExpire == DateTime.MaxValue)
      return TimeSpan.MaxValue;
 
    if (willExpire == DateTime.MinValue)
      return TimeSpan.MinValue;
 
    if (willExpire.CompareTo(DateTime.Now) > 0)
    {
      //the password has not expired
      //(pwdLast + MaxPwdAge)- Now = Time Left
      return willExpire.Subtract(DateTime.Now);
    }
 
    //the password has already expired
    return TimeSpan.MinValue;
  }
  
  private Int64 GetInt64(DirectoryEntry entry, string attr)
  {
    //we will use the marshaling behavior of
    //the searcher
    DirectorySearcher ds = new DirectorySearcher(
      entry,
      String.Format("({0}=*)", attr),
      new string[] { attr },
      SearchScope.Base
      );
      
    SearchResult sr = ds.FindOne();
    
    if (sr != null)
    {
      if (sr.Properties.Contains(attr))
      {
        return (Int64)sr.Properties[attr][0];
      }
    }
    return -1;
  }

Checking Password Expiration

string adsPath = "LDAP://CN=User1,OU=Users,DC=domain,DC=com";
 
DirectoryEntry user = new DirectoryEntry(
  adsPath,
  null,
  null,
  AuthenticationTypes.Secure
  );
 
string attrib = "msDS-User-Account-Control-Computed";
 
using (user)
{
  user.RefreshCache(new string[] { attrib });
 
  int flags = (int)user.Properties[attrib].Value
    & (int)AdsUserFlags.PasswordExpired);
 
  if (Convert.ToBoolean(flags)
  {
    //password has expired
    Console.WriteLine("Expired");
  }
}