Accessing UI controls in Task.Run with async/await on WinForms

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When you use Task.Run(), you’re saing that you don’t want the code to run on the current context, so that’s exactly what happens.

But there is no need to use Task.Run() in your code. Correctly written async methods won’t block the current thread, so you can use them from the UI thread directly. If you do that, await will make sure the method resumes back on the UI thread.

This means that if you write your code like this, it will work:

private async void button1_Click(object sender, EventArgs e)
{
    await Run();
}

private async Task Run()
{
    await File.AppendText("temp.dat").WriteAsync("a");
    label1.Text = "test";
}

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