Program.cs

using System.Net;
using IllinoisSiteScanner.PlatformCheck;

//TODO Change this to point to your location
var rootPath = "C:\\Users\\jonker\\source\\repos\\IllinoisSiteScanner\\";

var path = rootPath + "sitelist.txt";
var pathOutput = rootPath + "sitelist-output.txt";
var lines = File.ReadAllLines(path);
var heading = "URL\tResolved URL\tHost\tIP\tHost Information\tCMS Information\tServer Hosting\tToolkit2\tToolkit3\tH1\tV3 Site Name\tPrimary Site";
File.WriteAllText(pathOutput, heading + Environment.NewLine);

foreach (var url in lines) {
    try {
        using var httpClient = new HttpClient();
        var response = await httpClient.SendAsync(new HttpRequestMessage {
            Version = HttpVersion.Version10,
            RequestUri = new Uri(url),
            Method = HttpMethod.Get
        });

        _ = response.EnsureSuccessStatusCode();
        var html = await response.Content.ReadAsStringAsync();

        var myUri = new Uri(url);
        var ip = Dns.GetHostAddresses(response?.RequestMessage?.RequestUri?.Host ?? myUri.Host)[0];
        var line = url;
        line += "\t";
        line += response?.RequestMessage?.RequestUri?.AbsoluteUri ?? myUri.AbsoluteUri;
        line += "\t";
        line += response?.RequestMessage?.RequestUri?.Host ?? myUri.Host;
        line += "\t";
        line += ip;
        line += "\t";
        line += IpInformation.Check(ip.ToString(), response?.RequestMessage?.RequestUri?.Host ?? myUri.Host);
        line += "\t";
        line += CmsInformation.Check(html, ip.ToString());
        line += "\t";
        line += ServerInformation.Check(response?.Headers?.Server?.ToString() ?? "");
        line += "\t";
        var (oldToolkit, newToolkit) = ToolkitInformation.Check(html);
        line += oldToolkit;
        line += "\t";
        line += newToolkit;
        line += "\t";
        line += HeaderInformation.Check(html);
        line += "\t";
        line += PrimarySiteInformation.CheckSite(html);
        line += "\t";
        line += PrimarySiteInformation.Check(html);
        File.AppendAllText(pathOutput, line + Environment.NewLine);
        Console.WriteLine(url);
    } catch (Exception e) {
        File.AppendAllText(pathOutput, "error with " + url + ".\t" + e.Message + Environment.NewLine);
        Console.WriteLine("error with " + url + ". " + e.Message);
    }
}