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.NET Development
.NET Framework 3.5
 VerifyAccess Method
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This page is specific to
Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:
.NET Framework Class Library
DispatcherObject..::.VerifyAccess Method

Enforces that the calling thread has access to this DispatcherObject.

Namespace:  System.Windows.Threading
Assembly:  WindowsBase (in WindowsBase.dll)
Visual Basic (Declaration)
Public Sub VerifyAccess
Visual Basic (Usage)
Dim instance As DispatcherObject

instance.VerifyAccess()
C#
public void VerifyAccess()
Visual C++
public:
void VerifyAccess()
JScript
public function VerifyAccess()
XAML
You cannot use methods in XAML.
ExceptionCondition
InvalidOperationException

the calling thread does not have access to this DispatcherObject.

Only the thread the Dispatcher was created on may access the DispatcherObject.

Any thread can check to see whether it has access to this DispatcherObject.

The difference between CheckAccess and VerifyAccess is that CheckAccess returns a Boolean that specifies whether the calling thread has access to this DispatcherObject and VerifyAccess throws an exception if the calling thread does not have access to the this DispatcherObject.

The following example uses VerifyAccess to determine whether a thread has access to the thread that a Button was created on. If the calling thread does not have access, an InvalidOperationException is thrown.

C#
// Check if this thread has access to this object.
theButton.VerifyAccess();

// Thread has access to the object, so update the UI.
UpdateButtonUI(theButton);

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

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

.NET Framework

Supported in: 3.5, 3.0
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