Getting the Last day of month in dot net using C#

public DateTime Get_Last_Day_Of_Month(DateTime dt)
{
   return (Get_First_Day_Of_Month(dt)).AddMonths(1).AddDays(-1);
}

private DateTime Get_First_Day_Of_Month(DateTime dt)
{
   return new DateTime(dt.Year, dt.Month, 1);
} 
Response.Write(Get_Last_Day_Of_Month(DateTime.Now) + "<br/>");