PDF Tool using C# and iTextsharp

namespace PDFTool
{
    class Program
    {
        static void Main(string[] args)
        {
            clsSplitPDF splitPDF = new clsSplitPDF();
            string outputFileName = @"D:\PDF\OutputPDF.pdf";
            string inputFileName = @"D:\PDF\InputPDF.pdf";
            int fromPage = 10;
            int toPage = 15;
            if (File.Exists(inputFileName))
            {
                Common.TitleMessage("PDF Tool");
                splitPDF.CopyFile(outputFileName, inputFileName, fromPage, toPage);
                Common.DisplayMessage("Execution Completed.");
            }
            else
            {
                Common.DisplayMessage("Source file [" + inputFileName + "] does not exist.");
            }
            Console.ReadKey();
        }
    }

    public static class Common
    {
        public static void TitleMessage(string message)
        {
            Console.WriteLine("/***************************************************************/");
            Console.WriteLine("\t\t" + message);
            Console.WriteLine("/***************************************************************/");
        }
        public static void DisplayMessage(string message)
        {
            Console.WriteLine("\n" + message);
        }
        public static void ErrorMessage(string message)
        {
            Console.WriteLine("\n" + message);
        }
    }
    public class clsSplitPDF
    {
        public void CopyFile(string outputFileName, string inputFileName, int fromPage, int toPage)
        {
            int f = 0;
            // we create a reader for a certain document          
            PdfReader reader = new PdfReader(inputFileName);
            // we retrieve the total number of pages      
            int n = reader.NumberOfPages;
            // step 1: creation of a document-object     
            Document document = new Document(reader.GetPageSizeWithRotation(1));
            // step 2: we create a writer that listens to the document  
            PdfWriter writer = PdfWriter.GetInstance(document, new FileStream(outputFileName, FileMode.Create));
            // step 3: we open the document   
            document.Open();
            PdfContentByte cb = writer.DirectContent;
            PdfImportedPage page;
            int rotation;
            // step 4: we add content     
            int i = 0;
            if (n > fromPage && n > toPage)
            {
                while (i < n)
                {
                    i++;
                    if (i >= fromPage && i <= toPage)
                    {
                        document.SetPageSize(reader.GetPageSizeWithRotation(i));
                        document.NewPage();
                        page = writer.GetImportedPage(reader, i);
                        rotation = reader.GetPageRotation(i);
                        if (rotation == 90 || rotation == 270)
                        {
                            cb.AddTemplate(page, 0, -1f, 1f, 0, 0, reader.GetPageSizeWithRotation(i).Height);
                        }
                        else
                        {
                            cb.AddTemplate(page, 1f, 0, 0, 1f, 0, 0);
                        }
                    }

                }
                // step 5: we close the document         
                document.Close();
                Common.DisplayMessage("File Created.");
            }
            else
            {
                Common.ErrorMessage("Total Number is less than From Page/ To Page");
            }
            
        }
    }
}