private List <AttachmentMold> UploadAttachment()
{
var response = new SetAttachment();
var result = new List <AttachmentMold>();
Task.WaitAll(
AttachmentsPath.Select(attachment => Task.Run(() =>
{
var reqestResult =
_serviceClient
.PostFileWithRequest <AttachmentMold>(File.OpenRead(attachment), new FileInfo(attachment).Name, response);
result.Add(reqestResult);
})).ToArray());
return(result);
}