First of all, thank you for your answer concerning the Writitng data, I succeeded in writing now.
Now I have a problem and to be honnest I cannot find a solution.
Actually I made a DLL, in C#, using your DLL (Intel.Healthcare) in order to be use by my collegue in other language as VB.NET for example.
My DLL allows the computer programmer to just have to call a function "ReadRfid" (in my DLL) to read the rfid tag, when the user press the button ON the C5.
So, in order to test my DLL, I have created a WindowsApplication in C# which call functions of my DLL.
The Problem is that in my DLL, to initialize, I put the event which allows to recover the data and the ID when the user press the button on the C5 because we just want to use that button.
And when my WindowsApplication calls that initialize function, I have an InterprocessCommunicationException : interprocess communication failed.
I sent you a file with the part of the WindowsApplication which calls the DLL function, and the DLL function...
Thank you very much for your help!