public static string GetToken()
        {
            var assumeRoleRequest = new AssumeRoleRequest();

            assumeRoleRequest.RoleArn         = RoleArn;
            assumeRoleRequest.RoleSessionName = "robert_test";

            var assumeRoleResponse = DefaultClient.GetAcsResponse(assumeRoleRequest);

            return(assumeRoleResponse.Credentials.SecurityToken);
        }