Add Days in Date Formet(dd/MM/yyyy) in asp .net C#

If you are using DateTime datatype, you can use AddMonths method. If you are using string to take care of dates,

1. It is not right.
2. Convert it to DateTime and then add months.

DateTime _dt = DateTime.Now.AddMonths(no of months);
string _dateSting = _dt.ToString("dd/MM/yyyy");

convert your string to dateTime type and than AddMonths, below is my example:

dim strDate as string="16/04/1987"
dim dtDate as DateTime
       
        If DateTime.TryParseExact(strDate, "dd/MM/yyyy", Nothing,      DateTimeStyles.None, dtDate) Then
           console.write("Date Add Month::" & dtDate.AddMonth(1))
else
        console.write("invalid format")
        End If