private void CreatePdf(Dictionary<int, IExerciseDefinition> exercises)
        {
            var pdfGen = new PdfGenerator(ConfigSettings.RootPath);

            pdfGen.InitializePage(DateTime.Now);

            for (var i = 0; i < 25; i++)
            {
                var currentEx = _randomNumberGenerator.GetRandomNumber(0, exercises.Count);
                try
                {
                    pdfGen.AddLine(string.Format("{0:00}. {1}", i + 1, exercises[currentEx].CreateExercise(_randomNumberGenerator)));
                }
                catch (Exception e)
                {
                    pdfGen.AddLine(string.Format("fout bij oefening {0}: {1}", exercises[currentEx].Name, e.Message));
                }
            }

            pdfGen.Write();
        }