Having problems with accessing active directory using C#

My IS manager provided me with parameters in this format and I am trying use C# to validate a user against Active directory.

Here is a code sample (of course not the real credentials). How do I use these parameters to against a DirectoryEntry object so I can search for users etc.

provider-url=ldap://email.acmetech.com:1111/
base-dn=  DC=acmetecg,DC=com
security-authentication= simple
security-principal= CN=ldap,cn=users,DC=acmetech,DC=com
security-credentials= Ldap000

I know this should be simple but its been years since I've pr开发者_运维知识库ogrammed active directory.

Edit: How do I pass my params to a directory entry object so I can query objects in AD?

Using .NET 3.5 it's pretty easy.

using(PrincipalContext pc = new PrincipalContext(ContextType.Domain, "acmetecg"))
{
    // check the creds (assuming ldap is the user name, and ldap000 is the password)
    bool isValid = pc.ValidateCredentials("ldap", "ldap000")
}