PayPal recurring payments using DLL Using MVC(C#)

Question

I am integrating paypal payment gateway in one of site.After successful payment But My Second need is PayPal recurring payments Using DLL

 

Suppose that client choosed first option and after 30 days decided to continue service. Is it possible to set reccuring payment via paypal without need of client's interference* (we do not store any credit cards numbers in database).

 

I am Using this reference. https://developer.paypal.com/docs/classic/paypal-payments-pro/integration-guide/recurring-payments/

 

Please Give Demo Site 

Answer 1

DateTime t1 = Convert.ToDateTime(textBox1.Text); 
DateTime t2 = Convert.ToDateTime(textBox2.Text); 
TimeSpan ts = t1.Subtract(t2);

Answer 2

 TimeSpan duration = new TimeSpan(endtime.Ticks - startTime.Ticks);

Answer 3

string startTime = "7:00 AM"; 
string endTime = "2:00 PM";  
TimeSpan duration = DateTime.Parse(endTime).Subtract(DateTime.Parse(startTime));