My first experience with “Web Design” was around 1997. the DotCom thing was heating up and a client wanted to host a web site that was “Designed” by a “Internet Design Company” (that I swear was not in business even 10 days before).

The problem was that the “page was taking too long to load”. I looked at what they did, and saw that while it was a beautiful page (yes, the “site” was only one page!), it was one big .gif file (and this is in the age of 2800 baud modems).

What I did, was break up the parts of the image, into separate images laid out using tables (again this is before the .css gurus told us how evil that was). The “Site” loaded in a tenth of the time and I learned that “Designers are only good for making mock-ups, and only programmers know how to properly make web applications”.

I hate to admit that this has been my attitude until this year. The year I ran into Alan Beasley. Without intending...

I wanted to put a button that would set the current comment to “****” when the button was clicked. I am using View Model (MVVM) and normally you would need to resort to using code behind.

Actually it is simple to do.

 

Live Sample: http://silverlight.adefwebserver.com/RIATasks2ABValidation/RIATasksWeb/

There are many types of Silverlight Validation. This covers the most basic type, validating that the data entered matches the underlying type. In this example we will validate a Date Field.