converting synchronous function

AsyncExample.cs

class Test
{
    // Synchronous version
    public string MySyncFunction()
    {
        string text = File.ReadAllText("myfile.txt");
        return text;
    }

    // Asynchronous version. Notice ‘async Task’ and ‘await’.
    public async Task<string> MyAsyncFunction()
    {
        string text = await File.ReadAllTextAsync("myfile.txt");
        return text;
    }

    // Synchronous with async signature. Notice ‘Task.FromResult’ and missing ‘async’.
    public Task<string> MySyncFunctionWithAsyncSignature()
    {
        string text = File.ReadAllText("myfile.txt");
        return Task.FromResult(text);
    }
}