How to create licence version desktop application in c#

Hi Rushang,

        Creating licence for window application is very critical job.
you have to be careful about can not crack by any one. For that you have to use encoding- decoding algorithm.
 
        at start up of application it will check licence key exist or not. If exist than check it is expired or not. And if not exist than it will return product key. That product key is in encoding method. It consist hardware information like, Motherboad ID, Harddisk number.

        From that you have to create decoding licence by using another application which is created for licence only. You have also mention expiry date, No. of users, etc. Once its return licence key, put in your desktop application and check its validity. Than store it in database.

        For encoding and decoding algorithm you can use text to hexadecimal and hexadecimal to text method. Something like that another method also can be use.

        There are third party software also available for licencing.