Firstly, you really do not need two statements newin your first two lines, since those instances newwill be overwritten by what you assigned in the last two lines.
If you are new to C #, I suggest sticking to two lines at least so that you understand at least what happens in the steps. In particular, the last two lines:
ResponseList responsesList = responseService.ListSurveyResponses(1000);
PagedResponseList pagedResponsesList = responsesList.ResultData;
, responsesList , , ( , .ResultData responseService.ListSurveyResponses()):
PagedResponseList pagedResponsesList = responseService.ListSurveyResponses(1000).ResultData;