I can run this code in .NET FW 3.5 on Windows 8 , but I can't run this code in .NET FW 4.0 on Windows 8.

And

I can run this code in .NET FW 4.0 on other Windows (7,server2008 R2).

I use 64bit all windows only . I don't have NCrytoki Library for 64 bit

Thank you for support

Hello

cryptoki.dll we are using is from x64 driver, so it should be 64-bit. Basically, if we run the project using .NET Framework 3.5, it works without such error. However, when we attempt to use .NET Framework 4.0 or higher, we received the following error:

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

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

   at . (Int32 , Int32 , Byte[] , Int32 )
   at .C_Login(Int32 , Int32 , String )
   at Cryptware.NCryptoki.Session.Login(Int32 userType, String pin)
   at Cryptware.NDigitSign.DigitalSigner.Login(String pin)
   at FullTestNDigitSign.Form1.button4_Click(Object sender, EventArgs e) in d:\Users\Tito\Documents\Projects\TKS\Digital\FullTestNDigitSign\Form1.cs:line 45
   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.Button.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at FullTestNDigitSign.Program.Main() in d:\Users\Tito\Documents\Projects\TKS\Digital\FullTestNDigitSign\Program.cs:line 17
   at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()

Not exactly sure about your question, but there is no pin being passed. There is also no code that sets the encoding. The certificates are pre-configured as a mean of authentication between the client and the server.

Sorry, it is .NET string hardcoded into the sourcecode. It contains @ sign, English letters, and number

I tried to input other PIN number such as 1234 or even left blank, but got the same error. 

Try:

digitalSigner = new DigitalSigner(@"C:\\Progra~1\\LunaSA\\cryptoki.dll");