Merge PDF File using itextsharp library

Here i develop a class for merge pdf file in to C#.net using free source dll itextsharp.
Requirement: download iTextSharp.dll from below link
http://sourceforge.net/projects/itextsharp/
U should have .net framework on your machine.
Just copy paste this class in your project and use it by creating object of that class and passing sourceFiles array which contain all pdf file name which u want to merge and one destinationFile which u need to resulting final pdf file.
Only u need to add reference of that dll in your project and this class is working very well.

using System;
using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;
public class PdfMerge
{
	public static void MergeFiles(string destinationFile, string[] sourceFiles)
	{
		try
		{
			int f = 0;
			// we create a reader for a certain document
			PdfReader reader = new PdfReader(sourceFiles[f]);
			// we retrieve the total number of pages
			int n = reader.NumberOfPages;
			//Console.WriteLine("There are " + n + " pages in the original file.");
			// 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(destinationFile, FileMode.Create));
			// step 3: we open the document
			document.Open();
			PdfContentByte cb = writer.DirectContent;
			PdfImportedPage page;
			int rotation;
			// step 4: we add content
			while (f < sourceFiles.Length)
			{
				int i = 0;
				while (i < n)
				{
					i++;
					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);
					}
					//Console.WriteLine("Processed page " + i);
				}
				f++;
				if (f < sourceFiles.Length)
				{
					reader = new PdfReader(sourceFiles[f]);
					// we retrieve the total number of pages
					n = reader.NumberOfPages;
					//Console.WriteLine("There are " + n + " pages in the original file.");
				}
			}
			// step 5: we close the document
			document.Close();
		}
		catch(Exception e)
		{
            string strOb = e.Message;			
		}
	}

	public int CountPageNo(string strFileName)
	{	
		// we create a reader for a certain document
		PdfReader reader = new PdfReader(strFileName);
		// we retrieve the total number of pages
		return reader.NumberOfPages;
	}
}