Get Previous Month's First and Last Date -C#

Here this code, your can get previous month's first and last day. It's simple
 
static void Main(string[] arg)

{

  var year = DateTime.Today.Year;

  var month = DateTime.Today.Month;

  var firstDate = new DateTime(year, month, 1).AddMonths(-1);

  var lastDate = new DateTime(year, month, 1).AddDays(-1);

  Console.WriteLine("First day Previous Month: {0}", firstDate);

  Console.WriteLine("Last day Previous Month: {0}", lastDate);

   var lastday = GetMonthLastDate(2015, 6);
  Console.WriteLine("Last day : {0}", lastDate);

  Console.ReadLine();

}

You can use below method to get last date of any month of the any year.

private DateTime GetMonthLastDate(int year, int month)

{

   return new DateTime(year, month, DateTime.DaysInMonth(year, month));

}