C# Rental Project Problem

Also be mindful not to alienate good customers.
Whatever method you use I would suggest a phased removal of service.
ie, for the first 3 days after the month end, merely use a nagging screen, then remove a small section of usability, then a larger etc until it becomes completely useless.

Remember that people generally can google for alternatives, so don't go giving them the excuse to ditch your product.

This question is already answered. Please refer to

How To create the trial version setup my windows application use vb.net[^]

[The solution mentioned here is actually done in C#]

or Direct link is here :

Application Trial Maker[^]

http://www.ssware.com/cryptolicensing/cryptolicensing_net.htm[^]

by getting login and installation date idea given by you i have done it partially in this way


i have created an table named "Trial" in my db that have
1-LogDate
2-Logtype --login or logout
3-days

on login i m getting the last logdatetime and comparing it with datetime.now if its lessthan '0' (if user have changed time or date) then i m showing error "System outdated "
else user logon. and i subtract lastlogdate with date.now and add in days.

on application exit i m again checking lastlogin which i saved in static class and comapring it with datetime.now and same thing done on login, if date time is lessthan 1 it show error if not than easily logout.

On login i m checking days from db if days>=31 than user can't login.

Now plz tell me that i have done it correctly or not if not plz give me suggestion( the logdatetime is saving in encrypted text)

and also tell me when user pay me rent then how i should reactivate his application by giving him some serial, and if i have 100 customer than how the serial should identical each time for each customer

Regards