How to add different month to my date

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i have a Gym application and i have a offer for buy if you buy 3 month the amount will be 200 $ (example) what i looking for is how to remind the user before the 3 months end i have a column in my table with the start date i want to remind him 10 days before the end date
and i have a note that the offer my be changing like it will be 1 month , 5 month whatever ,,,,

What I have tried:

C#

DateTime nextMonth = date.AddDays(1).AddMonths(1).AddDays(-1);

bout it didn't help me
i want to change the AddMonths(1) with a textbox have the number for me it is the (offer).

Posted 11-Mar-19 19:43pm

el_tot93

Updated 11-Mar-19 23:21pm

v3

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CHill60 12-Mar-19 2:34am

Replace the one with the value of the text box (or other control). What's the problem?

el_tot93 12-Mar-19 2:35am

how it will be like plz

3 solutions

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Richard MacCutchan · Answer 1 · 2019-03-11T23:21:00

Solution 3

Take the date of last renewal and add the number of months to the next renewal (1, 3, 5 etc.). Subtract 10 from the days. Compare that to today's date to see whether the reminder should be sent.

Posted 11-Mar-19 23:21pm

Richard MacCutchan

Comments

el_tot93 12-Mar-19 5:23am

yes that i looking for but how can i do that i'm new in this idea i didn't do something like that before

Richard MacCutchan 12-Mar-19 5:36am

Go to DateTime Struct (System) | Microsoft Docs[^] where you will find examples.

CHill60 · Answer 2 · 2019-03-11T23:12:00

Solution 2

Instead of a TextBox you should really use a numericUpDown control[^] (I'm assuming WinForms here but there are equivalents in ASP.NET and WPF)

But for now .. (untested)

C#

int i;
DateTime nextMonth;
if(int.TryParse(txtBox.Text, out i) 
{
    nextMonth = date.AddDays(1).AddMonths(i).AddDays(-1);
}

Posted 11-Mar-19 23:12pm

CHill60

Updated 12-Mar-19 1:51am

v2

Comments

el_tot93 12-Mar-19 5:15am

i get me error in if(int.TryParse(txtBox.Text, i) red line under I

CHill60 12-Mar-19 7:54am

I did say it was untested. It would have been quicker for you to look up the documentation Int32.TryParse Method (System) | Microsoft Docs[^]
I've updated my solution correcting the typing error, but if you are going to downvote solutions without giving posters a chance to respond you're not going to win many friends

CPallini · Answer 3 · 2019-03-11T22:41:00

Solution 1

Are you really asking for c# - Get integer from Textbox - Stack Overflow[^] ?

Posted 11-Mar-19 22:41pm

CPallini

Comments

el_tot93 12-Mar-19 4:44am

i want to replace the one with the value of the textbox

CPallini 12-Mar-19 7:02am

The linked page shows you how to get the integer value, then you have only to plug such a value into the addMonths call.