Marshal.ZeroFreeBSTR Method (IntPtr)


Frees a BSTR pointer that was allocated using the SecureStringToBSTR method.

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

public static void ZeroFreeBSTR(
	IntPtr s


Type: System.IntPtr

The address of the BSTR to free.

The ZeroFreeBSTR method first sets the contents of the BSTR to zero, and then frees the BSTR.


requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

Universal Windows Platform
Available since 8
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1
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