Convert datetime?

Question

i try to write some code:

Firstly there is a textbox. if you write 13 in textbox, it equals 13.02.2009 (datetime)

Secondly if datetime.now equals 15.02.2009 , you write 13 in textbox, a function return 13.03.2009.

Help me thanks...

Answer 1

For the second time: go get a book.

DateTime whichday(int day)
{
 DateTime today = DateTime.Today;

 if(today.Day > day)
  return new DateTime(today.Year, today.Month, day).AddMonth(1);

 return new DateTime(today.Year, today.Month, day);
}

Answer 2

public static DateTime GetDate(int day)
{
    int month = 0;
    if (day >= DateTime.Now.Day) {month = DateTime.Now.Month;}
    else {month = (DateTime.Now.AddMonths(1).Month);}
    DateTime date = new DateTime(DateTime.Now.Year, month, day);
    return date;
}

Answer 3

Please try this code and what I mean. Thanks ScarletGarden. Maybe Natrium will learn something about my level.

 static void Main(string[] args)
        {

  DateTime startdate=Convert.ToDateTime("15.02.2009");
            int[] frequency ={ 16 }; 

            startdate = startdate.AddDays(1 - startdate.Day)
                 .AddDays(frequency[0] -  1)
                 .AddMonths((startdate.Day > frequency[0]) ?1:0);
            Console.Write(startdate.ToString());
            Console.ReadKey();}

For month 15th result is 16.02.2009 but for month 11th result is 11.03.2009 because frequency[0] > startdate is outofdate.