Install-Package Toxiproxy.Net

_proxyProcess = new Process()
    {
        StartInfo = new ProcessStartInfo(@".\packages\Toxiproxy.Net\compiled\Win64\toxiproxy-server-2.1.2-windows-amd64.exe")
    };
_proxyProcess.Start();

var connection = new Connection();
var client = connection.Client();
//proxy all traffic from 127.0.0.1:44399 to https://google.com
var localToGoogleProxy = new Proxy() { 
    Name = "localToGoogle", 
    Enabled = true, 
    Listen = "127.0.0.1:44399", 
    Upstream = "google.com:443" 
};
client.Add(localToGoogleProxy);

var connection = new Connection();
var client = connection.Client();
var proxy = client.FindProxy("localToGoogle");
proxy.Enabled = false;
proxy.Update();

var connection = new Connection();
var client = connection.Client();
var proxy = client.FindProxy("localToGoogle");
var timeoutProxy = new TimeoutToxic();
timeoutProxy.Attributes.Timeout = 100;
timeoutProxy.Toxicity = 1.0;
proxy.Add(timeoutProxy);
proxy.Update();

var connection = new Connection();
var client = connection.Client();
client.All();

// assuming the proxy is running with its default settings e.g. localhost:8474
// and there is a connection defined with the name "ms_sql"
// create a connection to toxiproxy that will call reset on disposal
// this resets the state of all the toxics and re-enables all of the proxies
    using (var connection = new Connection(true))
    {
        // find the upstream latency toxic
        var proxy = connection.Client().FindProxy("ms_sql");
        var latency = (LatencyToxic)proxy.GetToxicByName("Latency");
        // set a latency of 1 second 
        latency.Attributes.Latency = 1000;
        // save it
        proxy.Update();
        // do your test....
    }