C# Получение данных из Active Directory

 private const string Domain = "DomainName";
 readonly DirectoryEntry Entry = new DirectoryEntry("LDAP://" + Domain);
 readonly DirectorySearcher Dsearch = new DirectorySearcher(Entry);
 SearchResultCollection _sResultSetCol;
 string username="iamuser";
 Dsearch.Filter = "(&(samaccountname=" + iamuser+ "))";
 _sResultSetCol = Dsearch.FindAll();
 foreach (SearchResult sResultSet in _sResultSetCol)
 {
    return GetProperty(sResultSet, "name");
 }