hi. i am facing some problems in accessing Active Directory from my winform app. what I want is to create a user and query user from Active Directory.

here is code snippet for find user

 public bool FindUser(string username)
        {
            using (PrincipalContext context = new PrincipalContext(ContextType.Domain, this.domainName, this.DomainUserName, this.DomainPassword))
            {                
                UserPrincipal user = UserPrincipal.FindByIdentity(context, username);
                return (user != null) ? true : false;
            }
        }

i am unable to create object of PrincipalContext based on given arguments. i am getting this exception "{"The server could not be contacted."}"

and inner exception states that "{"The LDAP server is unavailable."}"

where as domain is running. i can ping to it and can also connect to this domain.

any suggestion about these exceptions?