How to convert a C char[][] in C#

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C#2.0

C

C#

Windows

WinForms

Win7

, +

Hi every body,
I'm working on Winform project in C# and I have to use a C written dll to communicate with an OpenVMS machine.

Some methods are using a C char** or an unsigned char** parameters

When i try to "translate" those parameters in string array, byte array or a StringBuilder and call thoses methods my software threw an AccesViolation.

I have the same problem when I replace thoses parameters with an IntPtr and use Marshal.Copy();

My software is build with the unsafe option.

Here an extract from the sources :

[DllImport("IPSecureClt.dll", EntryPoint = "IPSec_ListProjet")]
public static extern int IPSec_ListProject(
[In][Out][MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.LPTStr)]
ref string[] cListProjects,int iNbElement, ref int iNbProjects);
);

Here the C declaration :

long IPSec_ListProjet(char cList[][256+1], const unsigned long lNbElement, unsigned long *lNbProjets);

How could I convert the "C" char** to a "C#" string array ?

Thanks for helping