Refactoring LDAP/AD script from VBS to C#

I need to refactor a VBS dealing with LDAP, ADODB and ActiveDirectory from VBS to C#. The part I'm stuck is connecting (just starting and already stuck... great). This is the original source

Set objRootDSE = GetObject("LDAP://RootDSE")开发者_如何学编程
strConfig = objRootDSE.Get("configurationNamingContext")
strDNSDomain = objRootDSE.Get("defaultNamingContext")

Set adoCommand = CreateObject("ADODB.Command")
Set adoConnection = CreateObject("ADODB.Connection")
adoConnection.Provider = "ADsDSOObject"

adoConnection.Open "Active Directory Provider"
adoCommand.ActiveConnection = adoConnection

strQuery = "<LDAP://dm1.com.local/OU=CN,OU=Users,OU=CMS Organizational,OU=CMS_Users_and_Groups,DC=cms,DC=local>;(&(objectCategory=person)(objectClass=user)(!useraccountcontrol:1.2.840.113556.1.4.803:=2));distinguishedName,lastLogon,whenCreated;subtree"

adoCommand.CommandText = strQuery
adoCommand.Properties("Page Size") = 100
adoCommand.Properties("Timeout") = 60
adoCommand.Properties("Cache Results") = False

Set adoRecordset = adoCommand.Execute

And the C# looks like this

DirectoryEntry dse = new DirectoryEntry("LDAP://RootDSE");
string config = dse.Properties["configurationNamingContext"].Value.ToString();
string domain = dse.Properties["defaultNamingContext"].Value.ToString();
Connection connection = new Connection();
connection.Provider = "ADsDSOObject";
connection.Open("ADsDSOObject", "", "", 0);

object records, parameters = "";

ADODB.Command command = new Command();
command.ActiveConnection = connection;
command.CommandText = "<LDAP://dm1.com.local/OU=CN,OU=Users,OU=CMS Organizational,OU=CMS_Users_and_Groups,DC=cms,DC=local>;(&(objectCategory=person)(objectClass=user)(!useraccountcontrol:1.2.840.113556.1.4.803:=2));distinguishedName,lastLogon,whenCreated;subtree";
command.Execute(out records, ref parameters, 0);

It gives me the error

Interface not supported (Provider)
 at ADODB.CommandClass.Execute(Object& RecordsAffected, Object& Parameters, Int32 Options)
at Adug.Program.Main(String[] args) in E:\...\Program.cs:line 66

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I have no experience with querying LDAP via ADO, but I have used the following code successfully (simplified here), which makes use of DirectorySearcher:

DirectoryEntry directoryEntry = new DirectoryEntry(
      config.DirectoryConnectionString, 
      config.ActiveDirectoryUserName, 
      config.GetPassword(), 
      AuthenticationTypes.Secure);
DirectorySearcher ds = new DirectorySearcher(directoryEntry);

ds.PropertiesToLoad.Add("cn");
ds.PropertiesToLoad.Add("sAMAccountName");
ds.PropertiesToLoad.Add("mail");
ds.PropertiesToLoad.Add("displayName");

ds.Filter = "(objectClass=user)";

foreach (SearchResult result in ds.FindAll())
{
    string displayName = String.Empty;
    DirectoryEntry entry = result.GetDirectoryEntry();
    if (entry.Properties.Contains("displayName"))
            if (entry.Properties["displayName"].Count > 0)
                displayName  = entry.Properties["displayName"][0].ToString();
}

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Using the System.DirectoryServices namespace is the preferred method for accessing Active Directory in .NET. Daniel B's answer should get you moving in the right direction.