public InviteResponse InviteUserToGroup(ulong steamId, bool json, ulong group)
{
const string url = "https://steamcommunity.com/actions/GroupInvite/";
string sessionid =
(from Cookie cookie in _account.AuthContainer.GetCookies(new Uri("https://steamcommunity.com"))
where cookie.Name == "sessionid"
select cookie.Value).FirstOrDefault();
var data = new Dictionary<string, string>
{
{"json", json.IntValue().ToString()},
{"type", "groupInvite"},
{"group", group.ToString()},
{"sessionID", sessionid},
{"invitee", steamId.ToString()}
};
return _web.Fetch(url, "POST", data, _account.AuthContainer).DeserializeJson<InviteResponse>();
}