need to read data from specified coordinates in pdf?

private static void ExtractTextFromRegionOfPdf(string sourceFileName)
        {
            using (Stream pdfStream = new FileStream(sourceFileName, FileMode.Open))
            {
                PdfReader pdfReader = new PdfReader(pdfStream);
                System.util.RectangleJ rect = new System.util.RectangleJ(50, 650, 250, 140);
                RenderFilter[] renderFilter = new RenderFilter[1];
                renderFilter[0] = new RegionTextRenderFilter(rect);
                ITextExtractionStrategy textExtractionStrategy = new FilteredTextRenderListener(new LocationTextExtractionStrategy(), renderFilter);
                Console.WriteLine(PdfTextExtractor.GetTextFromPage(pdfReader, 1, textExtractionStrategy));
            }
        }