Get Domain User information

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C#

How can i get all current usernames of a windows domain?

if (!String.IsNullOrEmpty(domainName))
   {
      DirectoryEntry myDirectoryEntry = new DirectoryEntry(String.Format("LDAP://{0}", domainName));
    DirectorySearcher mySearcher = new DirectorySearcher(myDirectoryEntry);
    SortOption mySort = new SortOption("sn", SortDirection.Ascending);
    mySearcher.Filter = ("(objectCategory=person)");
    mySearcher.Sort = mySort;
      foreach (SearchResult resEnt in mySearcher.FindAll())
        {
         
          if ( System.Text.RegularExpressions.Regex.IsMatch(resEnt.Properties["displayName"][0].ToString(), "         |admin|test|service|system|[$]", System.Text.RegularExpressions.RegexOptions.IgnoreCase))
          {
           int space = resEnt.Properties["displayName"][0].ToString().IndexOf(" ");
           string formattedName = String.Format("{0}",
           resEnt.Properties["displayName"][0].ToString().Substring(space).PadRight(25), );
                  
           userList.Add(formattedName);
                            
           }
                       
           }
                        
     }

i tried this code but userList gets all registered Usernames in the Domain. I want to filter current logged in users