c# - ASP.NET Web API Async Tasks, sending Mails -

my application has massive performance problems. found problem comes sending of emails. how can fix problem method registeruser returns, while sending of email still in process? tried starting thread run sendemailconfirm method, gave me objectdisposedexception in sendemailconfirm

public async task<identityresult> registeruser(accountviewmodels.registerviewmodel usermodel) {     var result = await _usermanager.createasync(user, usermodel.password);     this.sendemailconfirm(usermodel.email);      return result; }  public async void sendemailconfirm(string mail) {      string subject = "please confirm email chronicus";     string body = "hello"     string email = user.email;      _messageservice.sendmail(mail, subject, body);  }  public void sendmail(string receiver, string subject, string body)     {         this._msg = new mailmessage(username, receiver);         this._msg.from = new mailaddress(username, name);         this._msg.subject = subject;         this._msg.body = body;         this._msg.isbodyhtml = true;         this._smtpclient.send(_msg);     } 

edit: added sendmail method question

you need use sendmailasync method of smtpclient class.

also, should return task async method return no value.

here how code like:

public async task<identityresult> registeruser(accountviewmodels.registerviewmodel usermodel) {     var result = await _usermanager.createasync(user, usermodel.password);     await this.sendemailconfirm(usermodel.email);      return result; }  public task sendemailconfirm(string mail) {     string subject = "please confirm email chronicus";     string body = "hello"     string email = user.email;      return _messageservice.sendmail(mail, subject, body); } 

and here how sendmail like:

public task sendmail(string receiver, string subject, string body) {     this._msg = new mailmessage(username, receiver);     this._msg.from = new mailaddress(username, name);     this._msg.subject = subject;     this._msg.body = body;     this._msg.isbodyhtml = true;      return this._smtpclient.sendmailasync(_msg); }