The request was aborted: Could not create SSL/TLS secure channel -Error in Asp.net

I got this following error "Could not create SSL/TLS secure channel" in your ASP.NET MVC WebClient application.

CODE:

    WebClient webClient = new WebClient();

    string content = webClient.DownloadString(url);

    HtmlDocument doc = new HtmlDocument();
    doc.LoadHtml(content);

SOLUTION:

Client servers might supported by SSL/TLS protocol versions. So you may specify the SSL/TLS protocol version in your code.

    WebClient webClient = new WebClient();

    ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

    string content = webClient.DownloadString(url);

    HtmlDocument doc = new HtmlDocument();
    doc.LoadHtml(content);

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