.NET Framework 4.6 and 4.5
(in System.Threading.Tasks.dll) mscorlib
The Task instance has been disposed.
The Task is not in a valid state to be started. It may have already been started, executed, or canceled, or it may have been created in a manner that doesn't support direct scheduling.
A task may only be started and run only once. Any attempts to schedule a task a second time will result in an exception.
Supported in: 4.6, 4.5, 4
.NET Framework Client Profile
Supported in: 4
.NET for Windows Phone apps
Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8
Portable Class Library
Supported in: Portable Class Library