using c# for upload text file

I'm trying to upload a text file to my account, but something I'ts wrong

static async Task Run()
{
	using (var dbx = new DropboxClient("MYTOKEN"))
	{
		var file = "list.txt";
		var folder = "/Users/user01/Downloads/";
		var lastpath = folder + file;
		var mem = new MemoryStream(File.ReadAllBytes(@"C:\Users\user01\Downloads\list.txt"));
		var upload = await dbx.Files.UploadAsync(lastpath, Dropbox.Api.Files.WriteMode.Overwrite.Instance, false, null, false, mem);
		Console.WriteLine(upload);
 
		Console.ReadLine();
	}
}