GTmetrix-net version 6

gtmetrix-net-sample1.cs

var request = new TestRequest(
    new Uri("http://devslice.net"),
    Locations.London,
    Browsers.Chrome)
    {
        // Optional settings
        EnableAdBlock = true, 
    };

gtmetrix-net-sample2.cs

new TestRequest(new Uri(TestData.TestWebsite))
{
    Browser = 3,
    ConnectionSpeed = "5000/1000/30",
    Location = 2
};

gtmetrix-net-sample3.cs

var client = Client(connection);   

var request = new TestRequest(
    new Uri("http://devslice.net"),
    Locations.London,
    Browsers.Chrome)
    {
        // Optional settings
        EnableAdBlock = true, 
    };                             

var response = client.SubmitTestAsync(request);

gtmetrix-net-sample4.cs

var response = client.GetTestAsync(result.Body.TestId);
var result = response.Result;

if (result.StatusCode == HttpStatusCode.OK && 
    result.Body.State == ResultStates.Completed)
{
  var pageLoadTime = result.Body.Results.PageLoadTime;
  ...
}

gtmetrix-net-sample5.cs

var response = client.DownloadResource("test_id", ResourceTypes.PageSpeed);

if(response.Result.StatusCode == HttpStatusCode.OK)
{
    File.WriteAllBytes("c:\\test\\PageSpeed.json", response.Result.Body);
}