Well below is my code but doesnt seems to work.

public async Task PerformStartChecking(int Bots, List<Proxy> ProxyCollection)
{
    var semaphore = new SemaphoreSlim(Bots);

    foreach (var proxy in ProxyCollection)
    {
        await semaphore.WaitAsync();

        _ = Task.Run(async () =>
        {
            try
            {
                var handler = new HttpClientHandler
                {
                    Proxy = new WebProxy($"http://{proxy.HostIP}:{proxy.Port}"),
                    UseProxy = true
                };

                using (var client = new HttpClient(handler))
                {
                    var response = await client.GetAsync("http://www.google.com");

                    if (response.IsSuccessStatusCode)
                    {
                        MessageBox.Show("Good");
                    }
                    else
                    {
                        MessageBox.Show("Error");
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show($"{ex}");
            }
            finally
            {
                semaphore.Release();
            }
        });
    }
}

Ok i dont know why it doesnt work but i got an exception saying this ( i think its a timeout error ) —>;

System.Threading.Tasks.TaskCanceledException: The request was
canceled due to the configured HttpClient.Timeout of 100 seconds
elapsing.
— > System.TimeoutException: The operation was canceled.
— > System.Threading.Tasks.TaskCanceledException: The operation
was canceled.
— > System.IO.IOException: Unable to read data from the transport
connection: The I/O operation has been aborted because of either a
thread exit or an application request ..
— > System.Net.Sockets.SocketException (995): The I/O operation has
been aborted because of either a thread exit or an application request.
— End of inner exception stack trace —
at
System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.ThrowExcep
tion(SocketError error, CancellationToken cancellationToken)
at
System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.System.Thre
ading.Tasks.Sources.IValueTaskSource<System.Int32>.GetResult(Int16
token)
at System.Net.Http.HttpConnection.InitialFillAsync(Boolean async)
at System.Net.Http.HttpConnection.SendAsync(HttpRequestMessage
request, Boolean async, CancellationToken cancellationToken)
— End of inner exception stack trace —
at System.Net.Http.HttpConnection.SendAsync(HttpRequestMessage
request, Boolean async, CancellationToken cancellationToken)
at
System.Net.Http.HttpConnectionPool.SendWithVersionDetectionAndRe
tryAsync(HttpRequestMessage request, Boolean async, Boolean
doRequestAuth, CancellationToken cancellationToken)
at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage
request, Boolean async, CancellationToken cancellationToken)
at
System.Net.Http.HttpClient .< SendAsync>g_Core|83_0(HttpRequestMes
sage request, HttpCompletionOption completionOption,
CancellationTokenSource cts, Boolean disposeCts,
CancellationTokenSource pendingRequestsCts, CancellationToken
originalCancellationToken)
— End of inner exception stack trace —
— End of inner exception stack trace —
at System.Net.Http.HttpClient.HandleFailure(Exception e, Boolean
telemetryStarted, HttpResponseMessage response,
CancellationTokenSource cts, CancellationToken cancellationToken,
CancellationTokenSource pendingRequestsCts)
at
System.Net.Http.HttpClient .< SendAsync>g_Core|83_0(HttpRequestMes
sage request, HttpCompletionOption completionOption,
CancellationTokenSource cts, Boolean disposeCts,
CancellationTokenSource pendingRequestsCts, CancellationToken
originalCancellationToken)
at