marshal unsigned cahr pointer

Question

Hello, I am trying to call c++ dll function calls from C#. The c++ dll function takes in pointer to unsigned char array. Can anybody help me in what marshalling parameter value that i have to declare in C# side. For eg: in c++ X.dll the function is: extern "C" __declspec(dllexport) void Getcharpointer(unsigned char* v) { //Just for test purpose, i alter and check on the C# side whether it persists. This is another thing which i want to do but i cant. v[0] = 'p'; } on the c# side declaration: -------------------------- [DllImport("X.dll",CharSet=CharSet.Auto)] static extern Getcharpointer([MarshalAs( UnmanagedType.LPStr )] System.String IncharPtr) ----- IF i try this syntax, the change doesnt persist in the value of the first index of unsigned char pointer array. Can anybody help me here?.Is this is the right way?. Thanks., Chellam.