IsInvalid Property
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CriticalHandle.IsInvalid Property

For apps that target Windows Phone OS 7.0 and 7.1, do not use any members of this type in your app. If you do, your code will throw a MethodAccessException. This type is security-critical, which restricts it to internal use by the .NET Framework for Windows Phone class library.
[SECURITY CRITICAL]

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

When overridden in a derived class, gets a value that indicates whether the handle value is invalid.

Namespace:  System.Runtime.InteropServices
Assembly:  mscorlib (in mscorlib.dll)

public abstract bool IsInvalid { get; }

Property Value

Type: System.Boolean
true if the handle is valid; otherwise, false.

Windows Phone OS

Supported in: 8.1, 8.0

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