Task.WaitAll Method (Task, Int32)
Waits for all of the provided Task objects to complete execution within a specified number of milliseconds.
Assembly: mscorlib (in mscorlib.dll)
One or more of the Task objects in tasks has been disposed.
The tasks argument is null.
millisecondsTimeout is a negative number other than -1, which represents an infinite time-out.
The tasks argument contains a null element.
The tasks argument is an empty array.
Available since 4.5
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Available since 5.0
Windows Phone Silverlight
Available since 8.0
Available since 8.1