read code mailbox with oauth2 in csharp

public static string Get_AccessToken_Hotmail(string data_hotmail, string _Proxy_ = "") { string accessToken = null; try { using (Leaf.xNet.HttpRequest request = new Leaf.xNet.HttpRequest()) { if (!string.IsNullOrEmpty(_Proxy_)) { Fake_proxy(request, _Proxy_); } string postData = $"client_id={data_hotmail.Split('|')[3]}" + $"&refresh_token={data_hotmail.Split('|')[2]}" + $"&grant_type=refresh_token"; string response = request.Post("https://login.microsoftonline.com/common/oauth2/v2.0/token", postData, "application/x-www-form-urlencoded").ToString(); dynamic json = Newtonsoft.Json.JsonConvert.DeserializeObject(response); accessToken = json.access_token; } } catch { try { using (Leaf.xNet.HttpRequest request = new Leaf.xNet.HttpRequest()) { string postData = $"client_id={data_hotmail.Split('|')[3]}" + $"&refresh_token={data_hotmail.Split('|')[2]}" + $"&grant_type=refresh_token"; string response = request.Post("https://login.microsoftonline.com/common/oauth2/v2.0/token", postData, "application/x-www-form-urlencoded").ToString(); dynamic json = Newtonsoft.Json.JsonConvert.DeserializeObject(response); accessToken = json.access_token; } } catch { } } return accessToken; } Get Inbox : public static string Get_Code_Hotmail_OAuth2(string data_hotmail, string accessToken) { string code = null; try { var server = new MailServer("outlook.office365.com", data_hotmail.Split('|')[0], accessToken, ServerProtocol.Imap4); server.AuthType = ServerAuthType.AuthXOAUTH2; server.SSLConnection = true; server.Port = 993; var mailClient = new MailClient("TryIt"); mailClient.Connect(server); var mailInfos = mailClient.GetMailInfos(); if ((uint)mailInfos.Length > 0U) { for (int i = 0; i < (mailInfos.Length > 20 ? 20 : mailInfos.Length); i++) { var info = mailInfos[mailInfos.Length - i - 1]; var mail = mailClient.GetMail(info); // process handle mail in here } } mailClient.Quit(); } catch { } return null; }