You are right,

the event Load of the Form was not associated with the "Form1_Load" function, so the line 28 is never executed. I associate the event with the function and it works now!

Thanks!

Hi, I'm testing the "Csharp-Document Viewer", so I insert the license key on line 28 of the file "Form1.cs": oLicenceManager.RegisterKEY("license number");//Please, replace XXXX by a valid demo or commercial license key. I generate the solution. But, when I ran the appl...