BasicRequestWithHttpClient.cs

using System;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;

namespace IntegrationTest
{
	internal class BasicRequestWithHttpClient
	{
		private const string Username = "";
		private const string Password = "";
		private const string ResourceUrl = "";

		private static void Main()
		{
			var response = GetResponse();
			Console.WriteLine(response);
			Console.WriteLine("Press any key to continue...");
			Console.ReadKey();
		}

		private static string GetResponse()
		{
			using (var client = GetClient(Username, Password))
			{
				var task = client.GetStringAsync(ResourceUrl);
				task.Wait();
				return task.Result;
			}
		}

		private static HttpClient GetClient(string username, string password)
		{
			var param = Convert.ToBase64String(Encoding.UTF8.GetBytes($"{username}:{password}"));
			var authValue = new AuthenticationHeaderValue("Basic", param);

			var client = new HttpClient
			{
				DefaultRequestHeaders = { Authorization = authValue }
				//Set some other client defaults like timeout / BaseAddress
			};
			return client;
		}
	}
}