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Error: Can not implicitly convert type 'System.Threading.Tasks.Task <long>' to 'long'



Not correct:

long ID = clsDB.Get_ID_by_RefNr_OnServer(ID_on_Server);



long ID = await clsDB.Get_ID_by_RefNr_OnServer(ID_on_Server);



Error: A second operation started in this context before a previous asynchronous operation completed.
Error: Can not implicitly convert type System.Threading.Tasks.Task long to long
Error caused by Caliburn Micro
WPF: System.Windows.Interactivity is broken or missing
WPF Error: An error occurred while signing
WPF Registry. DeleteSubKey: System.UnautohorizedAccessException
WPF: UserControl.Name does not use hyphen dashes


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