.NET async method

gistfile1.cs

public async Task<string> UsersLoginAsync(string login, string password)
{
    var url = "login.xml";
    var template = @"
        <?xml version=""1.0"" encoding=""UTF-8""?>
        <credentials>
            <login>{0}</login>
            <password>{1}</password>
        </credentials>
    ";
    var request = string.Format(template, login, password);

    var response = await this.PostAsync(url, request);

    var accounts = response.Root.Elements("account").Select(Account.Parse);

    return "accounts";
}


// WinR version

public IAsyncOperation<string> UsersLoginAsync(string login, string password)
{
    return AsyncInfo.Run(async (ct) => {
        var url = "login.xml";
        var template = @"
            <?xml version=""1.0"" encoding=""UTF-8""?>
            <credentials>
                <login>{0}</login>
                <password>{1}</password>
            </credentials>
        ";
        var request = string.Format(template, login, password);

        var response = await this.PostAsync(url, request);

        var accounts = response.Root.Elements("account").Select(Account.Parse);

        return "accounts";
    });
}