Now-a-days most of secure websites has
transferred their security protocol to TLS 1.2 protocol. In C#, default protocol
is taken as SSL3 or TLS. You must need to change this protocol before accessing
secure website with TLS 1.2 protocol. Just write below code before you call targeted
website.
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
This code will change the
calling request protocol to TLS 1.2. That’s
it
