Declaring the APIs for DPAPI in C#

I am using the article on Microsoft's site to create a DPAPI library
at:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/secmod/html/secmod21.asp

On the API declarations I am getting on error on the bool right before
the API name. The error is "Expected class, delegate, enum, interface,
or struct"
I'm not a C# wiz and I don't understand how to correct this, or why I
am getting it. Please help. I am getting the same error on all 3
declarations.

Thank you
Kalvin

/* BEGIN CODE */
[DllImport("Crypt32.dll", SetLastError=true,
CharSet=System.Runtime.InteropServices.CharSet.Auto)]
private static extern bool CryptProtectData(
ref DATA_BLOB pDataIn,
String szDataDescr,
ref DATA_BLOB pOptionalEntropy,
IntPtr pvReserved,
ref CRYPTPROTECT_PROMPTSTRUCT pPromptStruct,
int dwFlags,
ref DATA_BLOB pDataOut);

[DllImport("Crypt32.dll", SetLastError=true,
CharSet=System.Runtime.InteropServices.CharSet.Auto)]
private static extern bool CryptUnprotectData(
ref DATA_BLOB pDataIn,
String szDataDescr,
ref DATA_BLOB pOptionalEntropy,
IntPtr pvReserved,
ref CRYPTPROTECT_PROMPTSTRUCT pPromptStruct,
int dwFlags,
ref DATA_BLOB pDataOut);

[DllImport("kernel32.dll",
CharSet=System.Runtime.InteropServices.CharSet.Auto)]
private unsafe static extern int FormatMessage(int dwFlags,
ref IntPtr lpSource,
int dwMessageId,
int dwLanguageId,
ref String lpBuffer, int nSize,
IntPtr *Arguments);

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