How to get a value from Active Directory using C# PrincipalSearcher Class

Here is a sample C# program to get email id from active directory by username using PrincipalSearcher class.

using System.DirectoryServices.AccountManagement;

public string GetEmailIdFromActiveDirectory(string userName)

{

 var emailId = string.Empty;



 string activeDirectory_LDAP = "server";

 string activeDirectory_User = "ad_username";

 string activeDirectory_Password = "ad_password";



 PrincipalContext ctx = new PrincipalContext(ContextType.Domain, activeDirectory_LDAP);



 bool isCredentialsValid = ctx.ValidateCredentials(activeDirectory_User, activeDirectory_Password);



 if (isCredentialsValid)

 {

  UserPrincipal userPr = new UserPrincipal(ctx);

  userPr.SamAccountName = userName;



  PrincipalSearcher srchUser = new PrincipalSearcher(userPr);

  UserPrincipal foundUsr = srchUser.FindOne() as UserPrincipal;



  if (foundUsr != null)

  {

   emailId = foundUsr.Email;

  }

 }



 return emailId;

}