How can you find a user in active directory from C#?

Question

I\'m trying to figure out how to search AD from C# similarly to how \"Find Users, Contacts, and Groups\" works in the Active Directory Users and Computers tool. I have a str

Answer 1

Got this from the Joe Kaplan and Ethan Wilansky Article Use this Using (from referencing the System.DirectoryServices.AccountManagement dll):

using System.DirectoryServices.AccountManagement;

private bool CheckUserinAD(string domain, string username)
{
    PrincipalContext domainContext = new PrincipalContext(ContextType.Domain, domain);
    UserPrincipal user = new UserPrincipal(domainContext);
    user.Name = username;
    PrincipalSearcher pS = new PrincipalSearcher();
    pS.QueryFilter = user;
    PrincipalSearchResult results = pS.FindAll();
    if (results != null && results.Count() > 0)
        return true;
    return false;
}