Extract day of week and days in Month from a particular date

int iMonth = 4;
int iYear = 2011;
int iDay = 1;
DateTime dateValue = new DateTime(iYear, 4, 1);

int iDayOfWeek = ((int)dateValue.DayOfWeek);


//to find out days in month
int iDaysInMonth = System.DateTime.DaysInMonth(2001, iMonth);