title: how to find date range between two dates in days format using linq c#
body: <p>I have a requirement for generating report in form of 15 days,30 days,45 days.
  I have to compare the list data which is coming from db with current date.example if difference is 5days. It is less than 15,so i should send to 15 days ,if >15 i should send to greater than 15etc.How to write linq query for this.can any one help on this please</p>