PocketMatrix

Hi My name is Kamil and I've got one question.
I wrote in C# a program for Pocket PC (WM 2003SE 4.21.1088, ARM SA1110) which using GX.DLL
library and everything works beautiful but when I tried wrote the same program for
other unit (Win CE .NET 4.20, ARM920) I lost acces to GX.DLL file and I've got
Error "MissingMethodException".

For example I'm using:

[DllImport("gx.dll", EntryPoint="#2", SetLastError=true)]
public extern static int CloseDisplay();

to acces to procedures in gx.dll and this works fine with other DLL files on this unit only
with gx.dll I've got error and it does'nt matter where I put this file.
I check everything what I found in internet about the problem with "MissingMethodException"
error and only what I think this library dont work with this unit. I tried instaling
GAPI for Handheld PC’s from http://www.wincesoft.de/html/gapi_for_hpc_s.html
but it's not handheld The similar problem I've got with other aplications from internet
which using this file.This aplications can't see gx.dll file. I'm tried put this file everywhere
(the same folder,windows folder, program files folder everywhere) and nothing.


Coud You tell me what's wrong or what I'm doing wrong if You know, PLEASE.