How to do both simultaneously?

Question

i am working on an C# application..

let me explain

I want to let user to download an a book using my given link in button_2. but the condition is that

user can only click the button when he/she shares this application on whatsapp by clicking on Button_1

for that I did this code.

 

protected void Button1_Click(object sender, EventArgs e)

   {

      Response.Redirect("https://api.whatsapp.com/send?text=This app is giving Unlimited       Paytm cash to celebrate Independence go and download the app for free       http://student-cell.com/mybook");

      Button2.Enabled = true;

 

   }

protected void Button2_Click(object sender, EventArgs e)

   {

      Response.Redirect("http://mybook-studg.com");

   }

 

If a user tries to click the button_2 without clicking on Button_1 it can not happen because I went to Button_2 property and did Enabled is False.

 

 

 Please share me the right code.