Having problems with C# unsafe.

[Robert Rae]

I'm calling the C++ function below from C#:

GENCLIENT_API int CleanseEx(char ncSystem, const char *strServer,
const char **pNames, const char **pInputData,
const char **pRules, char ***pOutputData);

I can call this function from a console application however when I attempt
to use the same code from within a web service I get the following error:

************************************************** *******
An unhandled exception of type 'System.Web.Services.Protocols.SoapException'
occurred in system.web.services.dll

Additional information: Server was unable to process request. --> Object
reference not set to an instance of an object.
************************************************** *******

I'm spinning my wheels trying to figure out if this is a pointer problem or
a code access securing problem, etc... Below are the variables and method
call from my C# application:

[DllImport(@"d:\tempdlllocation\genclient.dll",
arSet.Ansi,
EntryPoint="CleanseEx")]
private unsafe static extern int CleanseEx(char SystemId, string Server,
string[]Names, string[] InputData, string[] Rules, byte*** OutputData);

int retCode;
char _SystemId = 'G';
string _Server = "TestServer";
string[] _Names = new string[100];
string[] _Rules = new string[100];
string[] outputData = new string[100];

....... the various arrays are populated with data values.

unsafe
{
byte ** pOutput = null;
retCode = CleanseEx(_SystemId, _Server, _Names, _InputData, _Rules, &pOutput);
..... code fails on the call above when calling from web service.
}
.......

Any help or recommendations would be really appreciated.