delete method
Implementation
Future<void> delete(Message message) async {
String target = "__Page";
String url = student.buildUrl(
"beskeder2.aspx?elevid=${student.studentId}&selectedfolderid=${message.ref.folderId}");
await postLoggedInPageSoup(url, target, {
"__EVENTARGUMENT": "HIDEMESSAGE_${message.ref.normalizedId}",
r"s$m$Content$Content$ListGridSelectionTree$folders":
message.ref.folderId.toString()
});
}