Dev2.Communication.ExecuteMessage.SetMessage C# (CSharp) Method

        public void SetMessage(string message)
        {
            Message.Append(message);
        }
    }

        public StringBuilder Execute(Dictionary<string, StringBuilder> values, IWorkspace theWorkspace)
        {
            string domain = null;
            string username = null;
            string password = null;

            StringBuilder tmp;
            values.TryGetValue("Domain", out tmp);
            if(tmp != null)
            {
                domain = tmp.ToString();
            }

            values.TryGetValue("Username", out tmp);

            if(tmp != null)
            {
                username = tmp.ToString();
            }

            values.TryGetValue("Password", out tmp);

            if(tmp != null)
            {
                password = tmp.ToString();
            }


            if(string.IsNullOrEmpty(domain) || string.IsNullOrEmpty(username) || string.IsNullOrEmpty(password))
            {
                throw new InvalidDataContractException("Domain or Username or Password is missing");
            }

            var result = new ExecuteMessage { HasError = false };

            try
            {
                if(domain.Equals("."))
                {
                    domain = Environment.UserDomainName;
                }
                bool isValid;
                using(var context = new PrincipalContext(ContextType.Domain, domain))
                {
                    isValid = context.ValidateCredentials(username, password);

                    context.Dispose();
                }
                result.SetMessage(isValid ? "<result>Connection successful!</result>" : "<result>Connection failed. Ensure your username and password are valid</result>");
            }
            catch
            {
                result.SetMessage("<result>Connection failed. Ensure your username and password are valid</result>");
            }

            Dev2JsonSerializer serializer = new Dev2JsonSerializer();

            return serializer.SerializeToBuilder(result);
        }