public bool CheckExistence(string username)
        {
            var client = new CADService.CAD_InterfaceClient();

            client.ClientCredentials.Windows.ClientCredential.UserName = "******";
            client.ClientCredentials.Windows.ClientCredential.Password = "******";
            return(client.CheckExistence(username));
        }
        public bool Authenticate(string username, string password)
        {
            var client = new CADService.CAD_InterfaceClient();

            client.ClientCredentials.Windows.ClientCredential.UserName = "******";
            client.ClientCredentials.Windows.ClientCredential.Password = "******";
            return(client.Authenticate(username, password));
        }