Get last day of particular month

// for getting last day of current month

int i = System.DateTime.DaysInMonth(DateTime.Now.Year, DateTime.Now.Month);

// for getting last day of specified month and year.

int j = System.DateTime.DaysInMonth(2010,3);

MessageBox.Show("Last Day is : " + i.ToString());

MessageBox.Show("Last Day is : " + j.ToString());