System.AccessViolationException - Returning from cpp dll

[ToolMaker2007]

Hi All, Im sure this is easy. I'm forgotten to cpp. I need to write cpp wrapper over a dot net c# web service proxy class. I thought I would start with this basic tutorial...LOL already stuck. Overview: I have a Dotnet(c# managed) dll just adding some text to your input string:

public class CSharpClass
{
public static byte[] Hello(byte[] name)
{
string s = ", hello from .NET!";
byte[] helloPart = Encoding.ASCII.GetBytes(s);
byte[] whole =
new byte[name.Length + helloPart.Length];
int i = 0;
foreach (byte b in name)
{
whole[i++] = b;
}
foreach (byte b in helloPart)
{
whole[i++] = b;
}
return whole;
}
}

This get consummed by the CPP dll:

using namespace CSharpAssembly;

__declspec(dllexport) char* __stdcall Hello(char* name)
{
int i = 0;
while (*name != '\0')
{
i++;
name++;
}
array<unsigned char>^ nameManArr = gcnew array<unsigned char>(i);
name -= i;
i = 0;
while (*name != '\0')
{
nameManArr[i] = *name;
name++;
i++;
}
array<unsigned char>^ char8ManArr = CSharpClass::Hello(nameManArr);
char* char8UnmanArr = new char[char8ManArr->Length + 1];
for (int i = 0; i < char8ManArr->Length; i++)
{
char8UnmanArr[i] = char8ManArr[i];
}
char8UnmanArr[char8ManArr->Length] = '\0';
return char8UnmanArr;
}

I have a debug entry test command line app (C#) consuming the C++ dll.

class DebugEntry
{
[DllImport("CppStdcallInerfaceWrapper2.dll",
CharSet = CharSet.Ansi, CallingConvention =
CallingConvention.StdCall)]
public static extern string Hello(string name);

    static void Main(string\[\] args)
    {
        string sd = Hello("MyName");
        System.Console.WriteLine();
        System.Console.ReadLine();
    }
}

When I run the command line app I can debug through the cpp dll into the C# dll but when I return from the cpp dll I get error on returning to the debug commanline app. I get error:

An unhandled exception of type 'System.AccessViolationException' occurred in mscorlib.dll

Additional information: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

[User 10455964]

What do you mean by returning? You mean after you invoke the static method Hello.