Why in my WebClient DownloadFileAsync method downloading an Empty File?

Question

I have this C# code but the final esi.zip results in 0 length or basically empty. The URL does exist and confirms to download the file manually. I am baffled buy this.

Answer 1

Adding this worked very fine for me! Thanks!

System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls | System.Net.SecurityProtocolType.Tls11 | System.Net.SecurityProtocolType.Tls12;