PurplePen.PdfMapFile.BeginConversion C# (CSharp) Method

        public ConversionStatus BeginConversion()
        {
            if (!SourceExists) {
                conversionOutput = string.Format("File '{0}' does not exist.", pdfFileName);
                status = ConversionStatus.Failure;
                return status;
            }

            CleanCacheDirectory();

            string cacheFileName = GetCacheFileName(pdfFileName);
            if (File.Exists(cacheFileName)) {
                // Cached file still exists. Use it.
                conversionOutput = "";
                pngFileName = cacheFileName;
                status = ConversionStatus.Success;
                return status;
            }

            return BeginUncachedConversion(cacheFileName, Resolution);
        }

        public static PdfMapFile ValidatePdf(string pdfFileName, out float dpi, out Size bitmapSize, out string errorMessageText)
        {
            IPdfLoadingStatus loadingStatus = new PdfLoadingUI();  // UNDONE: Should this be passed in instead?

            PdfMapFile mapFile = new PdfMapFile(pdfFileName);

            bool ok = true;
            PdfMapFile.ConversionStatus status = mapFile.BeginConversion();
            if (status == PdfMapFile.ConversionStatus.Working) {
                // Put up a modal dialog until loading is complete.
                mapFile.ConversionCompleted += delegate { 
                    loadingStatus.LoadingComplete(mapFile.Status == PdfMapFile.ConversionStatus.Success, mapFile.ConversionOutput);
                };
                if (status == PdfMapFile.ConversionStatus.Working) {
                    ok = loadingStatus.ShowLoadingStatus(pdfFileName);
                }
            }

            status = mapFile.Status;
            if (!ok || status == PdfMapFile.ConversionStatus.Failure) {
                errorMessageText = MiscText.PdfConversionFailed;
                if (!string.IsNullOrWhiteSpace(mapFile.ConversionOutput))
                    errorMessageText += ": " + mapFile.ConversionOutput;
                dpi = 0;
                bitmapSize = default(Size);
                return null;
            }

            // Make sure resulting image file can be read.
            try {
                Bitmap bitmap = (Bitmap)Image.FromFile(mapFile.PngFileName);
                dpi = bitmap.HorizontalResolution;
                bitmapSize = bitmap.Size;
                bitmap.Dispose();
                errorMessageText = "";
                return mapFile;
            }
            catch {
                // Couldn't read the resulting PNG
                errorMessageText = string.Format(MiscText.PdfResultNotReadable, mapFile.PngFileName);
                dpi = 0;
                bitmapSize = default(Size);
                return null;
            }
        }