查看以下链接.他们会给您一个想法，告诉您如何实现.
如何为Windows应用程序授予许可 [ ^ ]
为C#应用程序创建有效期 [ ^ ]
为C#应用程序创建产品密钥 [ ^ ]
许可证密钥生成 [

Check out the following links. They will give you an idea how you can accomplish.
How to give licensing for the windows application[^]
Create an expiration for C# application[^]
Creating a product key for C# application[^]
License Key Generation[^]

Good luck.