Using ASP.NET PDF Viewer Control
How to view a merged PDF from multiple files in ASP.NET PDF Viewer control using C#?

Open, read, view and comment a new merged PDF from multiple files in ASP.NET using C# is very simple. EdgePDF provides a simple C# demo code to accomplish the job.

• Create a new combined PDF from multiple PDF files, or other file formats, such as Word, Excel, PowerPoint, Tiff, JPG, PNG images
• Read, view, edit newly merged PDF file in web browser

How to view a merged PDF file programmatically in asp.net using C#

1. Download EdgePDF asp.net PDF viewer web control
2. Install EdgePDF demo project in IIS
3. Follow step by step tutorial

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Preparation

To run the following tutorial successfully, we need the following setup ready.

1. Install EdgePDF demo project in IIS
2. Several demo PDF files in folder C:\temp\merge\

How to read, view, a merged PDF from two PDF files online in ASP.NET C#?

The following steps and C# source code will help to setup a demo ASP.NET project, which allows you to read, view a merged PDF file from two PDF documents in web browser using ASP.NET C# code.

After you have completed the following guide, you can open, view a combined PDF file for commenting, editing through url (a sample url http://localhost:56643/?yourtarget1=merge/pdf-1.pdf&yourtarget2=merge/pdf-scanned-1.pdf)

• Open file UserCommandProcessHandler.ashx from {EdgePDF demo project}/RasterEdge_Resource_Files/
• Go to method FileProcess()
• Get two target PDF files' id from url parameter "yourtarget1" and "yourtarget2"
• Create two new PDFDocument object with target PDF files loaded
• Get a new PDF document PDFDocument object with two PDF files combined
• Call method REProcessControl.PageLoadFile() to load merged PDF document into EdgePDF for viewing, annotating, editing

    public override PDFWebDocument FileProcess()
    {
        HttpRequest request = this.Context.Request;

        if (!String.IsNullOrEmpty(request.QueryString["yourtarget1"]) && !String.IsNullOrEmpty(request.QueryString["yourtarget2"]))
        {
            PDFDocument sourceDoc1 = new PDFDocument(@"C:\\temp\" + request.QueryString["yourtarget1"]);
            PDFDocument sourceDoc2 = new PDFDocument(@"C:\\temp\" + request.QueryString["yourtarget2"]);

            PDFDocument[] sourceDocs = new PDFDocument[] {sourceDoc1, sourceDoc2};

            PDFDocument mergedDoc = PDFDocument.CombineDocument(sourceDocs);

            String fileName = "merged.pdf";
            return REProcessControl.PageLoadFile(request, this.Manager, mergedDoc, fileName);
        }
        else
        {
            Logger.Log(">>> Unknown load file mode. Load default file defined in Web.config.", LogType.DEBUG);

            // load default file. defined in Web.config
            return REProcessControl.PageLoadFile(request, this.Manager, "", LoadType.Server);
        }
    }