Anyone that has an idea of how to invoke the DeleteProfile function
from UserEnv.dll through P/Invoke is greatly appreciated.  I cannot see
to find any example anywhere on the web of how to import this function.

Based on the original C prototype it seems like it should be very easy
to import, but I continuously get "The parameter is incorrect." (error
87), when the function is invoked.

The prototype in UserEnv.h is:

BOOL DeleteProfileA(
 LPCSTR lpSidString,
 LPCSTR lpProfilePath,
 LPCSTR lpComputerName );

The import declaration I used is as follows:

[DllImport( "userenv.dll", CharSet = CharSet.Ansi,
EntryPoint = "DeleteProfileA", SetLastError = true )]
public static extern bool DeleteProfile(
 string lpSidString,
 string lpProfilePath,
 string lpComputerName );

I have tried numerous variations, including the use of the Unicode
version, applying the MarshalAsAttribute with UnmanagedType.LPStr for
ANSI and UnmanagedType.LPWStr for Unicode, all of which have failed
with the same result.

The following is an example of invoking the function:

if ( !Win32.DeleteProfile( sid, null, Environment.MachineName ) )
 Console.WriteLine( new Win32Exception( Marshal.GetLastWin32Error()
).Message );

According the MSDN documentation the lpProfilePath can be NULL and will
be looked up in the Registry.  I've also tried specifying this
parameter with the correct path and it still fails.   I'm 100% sure
that the SID translation is correct because both of the functions I
have to translate account name to SID and vice versa both work
correctly.

I'm currently running this on Windows XP SP2, using C# 1.1, but this
will also have to work on Win2K and Win2K3 (which I don't know why it
wouldn't).

Anyone that could shed some light on the subject would be greatly
appreciated.

Thanks,

Chris