example.cs

public static void Main(string[] args){
	var path = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "tester.txt");
	using(var eve = new AutoResetEvent(false))
	using(var file = new FileStream(path, FileMode.Create, FileAccess.ReadWrite, FileShare.Delete)){
		Task.Run(()=>{
			File.Delete(path);
			if(File.Exists(path))
				Console.WriteLine("File Exists");
			eve.Set();
		});
		eve.WaitOne();
	}
}