C#

for (int i = 0; i < counter; i++)
    {
        var thread = new Thread(() => GenerateVirusFile(i));
        thread.Start();
    }

class Program
    {
        static string folderPath;
        static readonly string fileContent = @"X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*";
    
        static void Main(string[] args)
        {
            folderPath = "F:\VirusScan";
    
            int counter = 1000;
            for (int i = 0; i < counter; i++)
            {
                var thread = new Thread(() => GenerateVirusFile(i));
                thread.Start();
            }
    
            Console.ReadKey();
        }
    
        static void GenerateVirusFile(int i)
        {
            string filePath = $@"{folderPath}\TestForVirusScan_{i}_{DateTime.Now.ToString("yyyyMMddHHmmssffff")}.txt";
    
            try
            {
                using (StreamWriter writer = new StreamWriter(filePath))
                {
                    writer.WriteLine(fileContent);
                }
    
                var timer = Stopwatch.StartNew();
                while (true)
                {
                    if (!File.Exists(filePath))
                    {
                        Console.WriteLine($"{i}: File was removed in {timer.ElapsedMilliseconds}ms");
                        break;
                    }
                    else
                    {
                        Thread.Sleep(1);
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"{i}: Exception {ex.GetType().Name} occurred: {ex.Message}");
            }
        }
    }

class Program
        {
            static string folderPath;
            static readonly string fileContent = @"X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*";
        
            static void Main(string[] args)
            {
                folderPath = "F:\VirusScan";
        
                int counter = 1000;
                List<Task> tasks = new List<Task>();
        
                for (int i = 1; i <= counter; i++)
                {
                    Task newTask = new Task((x) => GenerateVirusFile(x), i);                
                    tasks.Add(newTask);
                }
        
                foreach (var task in tasks)
                {
                    task.Start();
                }
        
                Task.WaitAll(tasks.ToArray()); 
        
                Console.ReadKey();
            }
        
            public static void GenerateVirusFile(object i)
            {
                string filePath = $@"{folderPath}\TestForVirusScan_{i}_{DateTime.Now.ToString("yyyyMMddHHmmssffff")}.txt";
        
                try
                {
                    using (StreamWriter writer = new StreamWriter(filePath))
                    {
                        writer.WriteLine(fileContent);
                    }
        
                    var timer = Stopwatch.StartNew();
                    while (true)
                    {
                        if (!File.Exists(filePath))
                        {
                            Console.WriteLine($"{i}: File was removed in {timer.ElapsedMilliseconds}ms");
                            break;
                        }
                        else
                        {
                            Thread.Sleep(1);
                        }
                    }
                }
                catch (Exception ex)
                {
                    Console.WriteLine($"{i}: Exception {ex.GetType().Name} occurred: {ex.Message}");
                }
            }
        }

public frmMain()
{
	Thread t = new Thread(new ThreadStart(Loading)); // Starting thread
        t.Start();
        InitializeComponent();

        // Code for loading component go here
            
        t.Abort();//Complete
}

//Start splash screen
void Loading()
{
	frmSplashScreen frm = new frmSplashScreen();
	Application.Run(frm);
}