How to Create or Modify PDF Form in ASP.net

Written by David Bauernschmidt Monday, 4 March 2013

It seems like regularly something comes up in the programming world that is requested by a client that should be easy, ends up proving to take more time, more money or both. So it is nice to find a solution to a problem that IS easy. This article is to show you how easy it is to use ASP.net web form to open up a PDF, set a value on a form and then send it back to the user’s browser. I have attached the project below if you want to download it. The first thing you need to do is go download iTextSharp.dll. I will be using visual basic (vb) for this project.

Step 1: Start VS 2012
Step 2: Create a new project
Step 3: Add the iTextSharp.dll reference that you downloaded from above.
Step 4: Create a new web page
Step 5: Add this to the code behind for the .aspx page created in step 4

Dim var As New iTextSharp.text.pdf.PdfReader(Server.MapPath("~/SamplePDF.pdf"))

Dim output As New MemoryStream()

Dim stamper As New iTextSharp.text.pdf.PdfStamper(var, output)

stamper.AcroFields.SetField("Name", "Fred Flinstone")
stamper.AcroFields.SetField("chk_Cash", "Yes") 'Match its export value

' Form fields should no longer be editable
stamper.FormFlattening = True

stamper.Close()
var.Close()

Response.AddHeader("Content-Disposition", "attachment; filename=YourPDF.pdf")
Response.ContentType = "application/pdf"

Response.BinaryWrite(output.ToArray())
Response.End()

Although this is very simple application you can take it and run with it. You can download the project from here.

DOWNLOAD

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