string textResponse;
byte[] bytesResponse

if (isRunning == true)
{
    textResponse = "Running";
    bytesResponse = ASCIIEncoding.ASCII.GetBytes(textResponse);

    // Console.WriteLine("Sending back : " + isRunning);
    // nwStream.Write(bytesResponse, 0, bytesResponse.Length);
    // client.Close();
    // listener.Stop();
}
{
    //execute if exe is not running:

    textResponse = "Stoped";
    bytesResponse = ASCIIEncoding.ASCII.GetBytes(textResponse);

    // Console.WriteLine("Sending back : " + isRunning);
    // nwStream.Write(bytesResponse, 0, bytesResponse.Length);
    // client.Close();
    // listener.Stop();
}

Console.WriteLine("Sending back : " + isRunning);
nwStream.Write(bytesResponse, 0, bytesResponse.Length);

client.Close();
listener.Stop();