C# WPF UnlockKey() Problem

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Hi folks,

I'm just testing out the trial version of QuickPDF library.
I've got the dll version working perfectly in C# winforms but for some reason in a C# WPF project the function qp.UnlockKey() always returns 0. Does QuickPDF library work correctly under WPF?
I assumed it would work in exactly the same way as in the winform version.

In the code snippet below, the msgbox "License unlock failed."  is always displayed in a WPF project.

Any help you can provide would be much appreciated.
- Drax

PDFLibrary qp = new PDFLibrary(@"C:\Program Files (x86)\Quick PDF Library\DLL\QuickPDF64DLL0816.dll");

qp.UnlockKey("My trial key");
            if (qp.Unlocked() == 0)
                MessageBox.Show("License unlock failed.  Please update your key in the form1.cs source code");

Edited by draxen - 21 Jul 12 at 10:53PM