/// <summary>
/// Send an email to the specified users, who must have added your application. You can only send one email to a user per day. Requires a session key for desktop apps, which may only send emails to the person whose session it is (does not require a session for web apps).
/// </summary>
/// <param name="recipients">Comma-separated list of recipient ids. These must be people who have added the application. You can email up to 100 people at a time.</param>
/// <param name="subject">Subject of the email.</param>
/// <param name="text">The plain text version of the email content. You must include at least one of either the fbml or text parameters. </param>
/// <param name="fbml">The FBML version of the email. You must include at least one of either the fbml or text parameters. The fbml parameter is a stripped-down set of FBML that allows only tags that result in text, links and linebreaks.</param>
/// <returns>This returns a comma-separated list of user ids for whom notifications were successfully sent. We will throw an error if an error occurred.</returns>
public string sendEmail(string recipients, string subject, string text, string fbml)
{
var parameterList = new Dictionary <string, string>
{
{ "method", "facebook.notifications.sendEmail" },
{ "recipients", recipients },
{ "subject", subject },
{ "text", text }
};
_api.AddFBMLParameter(parameterList, "fbml", fbml);
var response = _api.SendRequest(parameterList);
return(!string.IsNullOrEmpty(response) ? notifications_sendEmail_response.Parse(response).TypedValue : null);
}