BEST method TO delete all record?

Question

i have table like this

                Id  Employee_Id  Sector_Id Date          
       1    xxx          kkk       2015-12-15            
     1    sss          ddd       2015-12-15            
     1    fff          nnn       2015-12-15

i want to delete all records base on sector_Id and given date??
i have search google but there is no method to delete all record at once

i am using this code

 

var deleteRecord1 = _service.GetAllDutyPointStatus().Where(x => x.Date == dt && x.Sector_Id == sectorId).Count(); 
           if (deleteRecord1 != null)        
    {                _service.DeleteDutyPointStatus(deleteRecord1);            }         
   else            {                MsgLitteral.ShowNotificationInline("No Record Found!.", true);              }
when cleint click on delete button all record base on date and sector,all record delete