private void CreateAppFolder() { Google.Apis.Drive.v3.DriveService service = GoogleDriveFiles.GetDriveService(); bool isRootFolderExists = GoogleDriveFiles.CheckFolder(OAuthConstants.AppName, service); if (isRootFolderExists == false) { GoogleDriveFiles.CreateAppFolder(OAuthConstants.AppName, service); } FilesResource.ListRequest listRequest = service.Files.List(); IList <Google.Apis.Drive.v3.Data.File> mfiles = listRequest.Execute().Files; foreach (var file in mfiles) { if (file.Name == OAuthConstants.AppName) { LFLens.Helpers.Settings.RootFolderID = file.Id; } if (file.Name == OAuthConstants.PhotosFolderName) { LFLens.Helpers.Settings.PhotosFolderID = file.Id; } } }