Simple C# .NET 4.5 HTTPClient Request Using Basic Auth and Proxy

SimpleHttpClient.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net.Http;
using System.Net;


namespace HTTP_Test
{
    class program
    {
        static void Main()
        {
            Task t = new Task(HTTP_GET);
            t.Start();
            Console.ReadLine();
        }

        static async void HTTP_GET()
        {
            var TARGETURL = "http://en.wikipedia.org/";

            HttpClientHandler handler = new HttpClientHandler()
            {
                Proxy = new WebProxy("http://127.0.0.1:8888"),
                UseProxy = true,
            };

            Console.WriteLine("GET: + " + TARGETURL);

            // ... Use HttpClient.            
            HttpClient client = new HttpClient(handler);

            var byteArray = Encoding.ASCII.GetBytes("username:password1234");
            client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Basic", Convert.ToBase64String(byteArray));

            HttpResponseMessage response = await client.GetAsync(TARGETURL);
            HttpContent content = response.Content;

            // ... Check Status Code                                
            Console.WriteLine("Response StatusCode: " + (int)response.StatusCode);

            // ... Read the string.
            string result = await content.ReadAsStringAsync();

            // ... Display the result.
            if (result != null &&
            result.Length >= 50)
            {
                Console.WriteLine(result.Substring(0, 50) + "...");
            }
        }
    }
}

Great Work?

Can you guide me

How to handle below json format using C# (with Authentication) - Post Method with Body(Raw)

{

"CustomerCode": "F101",
"CusReferenceNo": "3",
"StationName": "fsa",
"SalesmanId": "5",
"OrderStatus": "CLS",
"PostingDate": "2021-01-07",

"orderDetails":[
    {

"ItemCode": "100-0001-00002",
"Quantity": "25000.000000",

}]

}

Appreciated, if you guide me and share sample code

Getting trouble with downloading the PFD files from the webpage ("https://www.*******.com/produ/abc.pdf) with user authentication through using C# "HttpClient"
The webpage having some Cookies also
i followed the same as your code.

Please guide me how download through code (C#)?

Getting trouble with downloading the PFD files from the webpage ("https://www.*******.com/produ/abc.pdf) with user authentication through using C# "HttpClient"
The webpage having some Cookies also
i followed the same as your code.

Thank you!