UserName through Active Directory(Internal) or LoginPage(External Users)

[pierrelami]

For external users, the login Page is what I want. Credentials are verified against database.dbo.table. Some of these users might not even be part of Active Directory. So that's fine. But for internal users, whom are part of Active Directory, I want to bypass login Page amd get username from Active Directory and go directly to process Application. How do I get that userName from Active directory. Everything I've tried comes up empty, unless I'm debugging from localhost. Thanks.

[PsychoCoder]

.NET offers the System.DirectoryServices Namespace for working with Active Directory (making common tasks much simpler). Here's a short example (crude but simple) of authenticating a user against AD:

public bool Authenticate(string domain, string username, string pwd)
    {
      string domainAndUsername = domain + @"\" + username;
      DirectoryEntry entry = new DirectoryEntry(_path, domainAndUsername, pwd);
 
      try
      {
        //Bind to the native AdsObject to force authentication.
        object obj = entry.NativeObject;
 
        DirectorySearcher search = new DirectorySearcher(entry);
 
        search.Filter = "(SAMAccountName=" + username + ")";
        search.PropertiesToLoad.Add("cn");
        SearchResult result = search.FindOne();
 
        if(null == result)
        {
          return false;
        }
 
        //Update the new path to the user in the directory.
        _path = result.Path;
        _filterAttribute = (string)result.Properties["cn"][0];
      }
      catch (Exception ex)
      {
        throw new Exception("Error authenticating user. " + ex.Message);
      }
 
      return true;
    }
 
 

Hope that helps :)