SecurityProtocolTypeExtensions.Tls12; does not exist in current context

Question

I am updating Security protocols to my existing 3.5 .net framework application to work my payment gateways smooth. I have added following code

System.Net         


        

Answer 1

The fix is stated in the article you linked to:

To include the support for TLS v1.2, include the source files in your project...

In other words - you need to add the SecurityProtocolTypeExtensions and SslProtocolExtensions types from the article to your own project.

It's a bit of an ugly hack, but is required because TLS 1.2 was released after .NET 3.5.

Alternatively if you want to avoid using these extensions and don't mind unlabelled magic numbers in your code, you could ignore the code in the article and just set this instead:

System.Net.ServicePointManager.SecurityProtocol = (SecurityProtocolType)0x00000C00;

Answer 2

Also check using System.Security.Authentication is at the top of the file