.NET Answers

Archive for June, 2009

Last week I showed how to use form fields to control placement of dynamic data.

But what if you want to dynamically place images in your PDF?  You can stuff them into a form field like you can with text.

However, one of the items you can retrieve from the form field is its location on the screen.  Using this, a little math, and some iTextSharp image code, we can place images in our PDF where the form field was located.  Here’s how I do it.

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I am about to embark on the “religious” topic of naming conventions.  I was reminded of this topic by the short post, “Hungarian Notation, what do I think”, by Richard Dingwall.

I’m sure there will be those of you who will disagree with me, but as I’ve stated in previous posts, these general guidelines I’ve been using for .NET programming have served me well since .NET 1.0; they are meant as strong suggestions for those who are looking for guidance, not rules I expect the industry to adopt because I know better than anyone else.

In fact, while I will propose what I consider the “best” way, I will also provide some alternatives.

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Chances are, you’ll eventually want to use a dialog box in combination with some form elements, and when you do, you’ll probably want to implement some validation.

True, there are some great validation routines available in jQuery, but they only validate on the client side.  They are, after all, Javascript.

As you are probably aware, the advantage of using validation controls with ASP.NET is that they validate on both the client side and the server side and even if we assume that everyone using our web page is using Javascript and has it turned on, there is still the possibility that someone will turn Javascript off so they can circumvent your validations.

So how do we use validation controls AND allow the form to be a jQuery dialog?

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When I first started generating PDFs dynamically, I was overwhelmed by the complexity of the API.  Not just with iTextSharp, but it seemed that all of the APIs were complex.

In looking through the API and comparing it to what I was actually trying to accomplish, I found there was a very small subset of classes and methods that I needed to use to accomplish the task at hand.  Now that I’ve learned more, I still use this same subset of commands for 90% of what I need to do in iTextSharp.

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