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Thread.Sleep Method (TimeSpan)

Suspends the current thread for the specified amount of time.

Namespace:  System.Threading
Assembly:  mscorlib (in mscorlib.dll)

Public Shared Sub Sleep ( _
	timeout As TimeSpan _


Type: System.TimeSpan

The amount of time for which the thread is suspended. If the value of the millisecondsTimeout argument is TimeSpan.Zero, the thread relinquishes the remainder of its time slice to any thread of equal priority that is ready to run. If there are no other threads of equal priority that are ready to run, execution of the current thread is not suspended.


The value of timeout is negative and is not equal to Timeout.Infinite in milliseconds, or is greater than Int32.MaxValue milliseconds.

The thread will not be scheduled for execution by the operating system for the amount of time specified. This method changes the state of the thread to include WaitSleepJoin.

You can specify Timeout.InfiniteTimeSpan for the timeout parameter to suspend the thread indefinitely. However, we recommend that you use other System.Threading classes such as Mutex, Monitor, EventWaitHandle, or Semaphore instead to sychronize threads or manage resources.

This overload of Sleep uses the total number of whole milliseconds in timeout. Fractional milliseconds are discarded.

This method does not perform standard COM and SendMessage pumping.


If you need to sleep on a thread that has STAThreadAttribute, but you want to perform standard COM and SendMessage pumping, consider using one of the overloads of the Join method that specifies a timeout interval.

The following example uses the Sleep(TimeSpan) method overload to block the application's main thread five times, for two seconds each time.

Imports System.Threading

Class Example

    Shared Sub Main()

        Dim interval As New TimeSpan(0, 0, 2)

        For i As Integer = 0 To 4
            Console.WriteLine("Sleep for 2 seconds.")

        Console.WriteLine("Main thread exits.")
    End Sub 
End Class 

' This example produces the following output: 

'Sleep for 2 seconds. 
'Sleep for 2 seconds. 
'Sleep for 2 seconds. 
'Sleep for 2 seconds. 
'Sleep for 2 seconds. 
'Main thread exits.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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