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How To: Merge Multiple Microsoft Word Documents in ASP.net

In this post i will show how to combine multiple word document in asp,net using " Microsoft Office Interop Assemblies"
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Merge.aspx.cs" Inherits="Merge" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
   <title>Untitled Page</title>
</head>
<body>
   <form id="form1" runat="server">
   <div>
       &nbsp;<table>
           <tr>
               <td style="width: 100px">
                   File1</td>
               <td style="width: 100px">
                   <asp:FileUpload ID="FileUpload1" runat="server" /></td>
           </tr>
           <tr>
               <td style="width: 100px">
                   File2</td>
               <td style="width: 100px">
                   <asp:FileUpload ID="FileUpload2" runat="server" /></td>
           </tr>
           <tr>
               <td style="width: 100px">
               </td>
               <td style="width: 100px">
       <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Merge" /></td>
           </tr>
       </table>
   </div>
   </form>
</body>
</html>
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using Word = Microsoft.Office.Interop.Word;


public partial class Merge : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {


    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        string[] strFiles ={ FileUpload1.PostedFile.FileName,FileUpload2.PostedFile.FileName };
        MsWord.Merge(strFiles, "c:\\output.doc", true);
    }
}
public class MsWord
{
    /// <summary>
    /// This is the default Word Document Template file
    /// </summary>
    private const string defaultWordDocumentTemplate = @"Normal.dot";

    /// <summary>
    /// A function that merges Microsoft Word Documents that uses the default template
    /// </summary>
    /// <param name="filesToMerge">An array of files that we want to merge</param>
    /// <param name="outputFilename">The filename of the merged document</param>
    /// <param name="insertPageBreaks">Set to true if you want to have page breaks inserted after each document</param>
    public static void Merge(string[] filesToMerge, string outputFilename, bool insertPageBreaks)
    {
        Merge(filesToMerge, outputFilename, insertPageBreaks, defaultWordDocumentTemplate);
    }

    /// <summary>
    /// A function that merges Microsoft Word Documents that uses a template specified by the user
    /// </summary>
    /// <param name="filesToMerge">An array of files that we want to merge</param>
    /// <param name="outputFilename">The filename of the merged document</param>
    /// <param name="insertPageBreaks">Set to true if you want to have page breaks inserted after each document</param>
    /// <param name="documentTemplate">The word document you want to use to serve as the template</param>
    public static void Merge(string[] filesToMerge, string outputFilename, bool insertPageBreaks, string documentTemplate)
    {
        object defaultTemplate = documentTemplate;
        object missing = System.Type.Missing;
        object pageBreak = Word.WdBreakType.wdPageBreak;
        object outputFile = outputFilename;

        // Create  a new Word application
        Word._Application wordApplication = new Word.Application();

        try
        {
            // Create a new file based on our template
            Word._Document wordDocument = wordApplication.Documents.Add(
                                          ref defaultTemplate
                                        , ref missing
                                        , ref missing
                                        , ref missing);

            // Make a Word selection object.
            Word.Selection selection = wordApplication.Selection;

            // Loop thru each of the Word documents
            foreach (string file in filesToMerge)
            {
                // Insert the files to our template
                selection.InsertFile(
                                            file
                                        , ref missing
                                        , ref missing
                                        , ref missing
                                        , ref missing);

                //Do we want page breaks added after each documents?
                if (insertPageBreaks)
                {
                    selection.InsertBreak(ref pageBreak);
                }
            }

            // Save the document to it's output file.
            wordDocument.SaveAs(
                            ref outputFile
                        , ref missing
                        , ref missing
                        , ref missing
                        , ref missing
                        , ref missing
                        , ref missing
                        , ref missing
                        , ref missing
                        , ref missing
                        , ref missing
                        , ref missing
                        , ref missing
                        , ref missing
                        , ref missing
                        , ref missing);

            // Clean up!
            wordDocument = null;
        }
        catch (Exception ex)
        {
           
            throw ex;
        }
        finally
        {
            // Finally, Close our Word application
            wordApplication.Quit(ref missing, ref missing, ref missing);
        }
    }
}

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