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    <p>Further to my second comment in the <a href="https://stackoverflow.com/a/14569342/197591">accepted Answer</a>, this is the code for performing an LDAP lookup which improves the original version I found <a href="http://www.codeproject.com/Articles/472540/Alternative-tnsping-utility" rel="nofollow noreferrer">here</a>. And it also handles server lists in the <strong>ldap.ora</strong> file that includes multiple delimited port numbers.</p> <pre><code>private static string ResolveServiceNameLdap(string serviceName) { string tnsAdminPath = Path.Combine(@"C:\Apps\oracle\network\admin", "ldap.ora"); string connectionString = string.Empty; // ldap.ora can contain many LDAP servers IEnumerable&lt;string&gt; directoryServers = null; if (File.Exists(tnsAdminPath)) { string defaultAdminContext = string.Empty; using (var sr = File.OpenText(tnsAdminPath)) { string line; while ((line = sr.ReadLine()) != null) { // Ignore commetns if (line.StartsWith("#")) { continue; } // Ignore empty lines if (line == string.Empty) { continue; } // If line starts with DEFAULT_ADMIN_CONTEXT then get its value if (line.StartsWith("DEFAULT_ADMIN_CONTEXT")) { defaultAdminContext = line.Substring(line.IndexOf('=') + 1).Trim(new[] {'\"', ' '}); } // If line starts with DIRECTORY_SERVERS then get its value if (line.StartsWith("DIRECTORY_SERVERS")) { string[] serversPorts = line.Substring(line.IndexOf('=') + 1).Trim(new[] {'(', ')', ' '}).Split(','); directoryServers = serversPorts.SelectMany(x =&gt; { // If the server includes multiple port numbers, this needs to be handled string[] serverPorts = x.Split(':'); if (serverPorts.Count() &gt; 1) { return serverPorts.Skip(1).Select(y =&gt; string.Format("{0}:{1}", serverPorts.First(), y)); } return new[] {x}; }); } } } // Iterate through each LDAP server, and try to connect foreach (string directoryServer in directoryServers) { // Try to connect to LDAP server with using default admin contact try { var directoryEntry = new DirectoryEntry("LDAP://" + directoryServer + "/" + defaultAdminContext, null, null, AuthenticationTypes.Anonymous); var directorySearcher = new DirectorySearcher(directoryEntry, "(&amp;(objectclass=orclNetService)(cn=" + serviceName + "))", new[] { "orclnetdescstring" }, SearchScope.Subtree); SearchResult searchResult = directorySearcher.FindOne(); var value = searchResult.Properties["orclnetdescstring"][0] as byte[]; if (value != null) { connectionString = Encoding.Default.GetString(value); } // If the connection was successful, then not necessary to try other LDAP servers break; } catch { // If the connection to LDAP server not successful, try to connect to the next LDAP server continue; } } // If casting was not successful, or not found any TNS value, then result is an error message if (string.IsNullOrEmpty(connectionString)) { connectionString = "TNS value not found in LDAP"; } } else { // If ldap.ora doesn't exist, then return error message connectionString = "ldap.ora not found"; } return connectionString; } </code></pre>
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    1. POHow do I query LDAP from C# to resolve Oracle TNS hostname while using managed ODP.NET?
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      1. VTUpMod
    1. COSuper handy! Thought there was no hope of using the managed libraries because we use LDAP, saves me a lot of time with some new projects.
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