LDAP helper (works in MVC)

LDAP.cs

using System.DirectoryServices;

public class LDAP
{
    static DirectoryEntry _de = new DirectoryEntry("LDAP://[LDAP server host]", "[service account]", "[service account password]");

    static T LookupAnd<T>(string LoginName, System.Func<SearchResult,T> cb)
    {
        using (var dsearch = new DirectorySearcher(_de))
        {
            dsearch.Filter = "(&(objectClass=person)(SAMAccountName=" + LoginName.Split('\\')[1] + "))";
            var user = dsearch.FindOne();

            if (user == null)
            {
                return default(T);
            }

            return cb(user);
        }
    }

    public static string GetUsername(string LoginName)
    {
        return LookupAnd(LoginName, u => u.Properties["Name"][0].ToString());
    }

    public static string GetEmail(string LoginName)
    {
        return LookupAnd(LoginName, u => u.Properties["mail"][0].ToString());
    }

}