ProgressBar + BackgroundWorker + Spinner + LoadingCircle when loading data (edit)

https://stackoverflow.com/questions/3529928/how-do-i-put-text-on-progressbar/3529945#3529945

https://stackoverflow.com/questions/12126889/how-to-use-winforms-progress-bar/12127025#12127025

https://social.msdn.microsoft.com/Forums/vstudio/en-US/e0148430-d4fc-44f5-a05f-23dc5bbe23e4/how-to-use-progress-barspinner-when-data-is-loading-in-datagridview?forum=winforms

https://stackoverflow.com/questions/36076924/c-sharp-winforms-how-can-i-display-a-loading-control-while-a-process-is-waitin?lq=1