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Thread.Sleep Method (Int32)

Suspends the current thread for a specified time.

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

Public Shared Sub Sleep ( _
	millisecondsTimeout As Integer _


Type: System.Int32
The number of milliseconds for which the thread is blocked. Specify zero (0) to indicate that this thread should be suspended to allow other waiting threads to execute. Specify Infinite to block the thread indefinitely.


The time-out value is negative and is not equal to Infinite.

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.

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 method to block the application's main thread.

Imports System.Threading

Class Example

    Shared Sub Main()

        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, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.