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Achieving a true 3-Tiered Architecture through Load Balancing. Follow us! Net this is not straightforward. You also need to consider something very important, the ViewState is validated by default on each post , you can turn it off, but it is not recommended if you want to be sure your ViewState has not been corrupted take a look at this question. Consider this example, you have two DropDownList controls, named: ddl1, ddl2 ddl2 depends on ddl1 so using the SelectedIndexChanged event you fill the second drop down list.
You could use a third party framework to bind these controls using javascript, I can recommend you knockoutjs it's awesome. This is the problem. After you have changed the content of the second DropDownList using javascript, you cannot do a simple post to your page because the ViewState will not be valid , and you will see the following exception:.
The workaround is to specify which values will be valid in the server side, in order to do that you need to override the page Render method and specify each one of the values of the second drop down list , but this will increase the page size and obviously, this is not a good option. So as a summary, if you want to get rid-off all your UpdatePanel controls, you will need to replace the existing server controls for javascript-friendly controls. Also remmeber that if you do that, instead of relying on the page post mechanism, you would have to use AJAX to perform operations on the server, otherwise, you will get the Invalid postback or callback argument.
In other words it would be better to consider moving to a MVC application if possible. Well I happened to solve this problem the day after posting it. Of course there are now new hurdles to tackle but I am happy to say that my asynchronous chat module is nearly done.
NET since, while Googling the matter, this post was the only relevant result popping up. I'll start by saying I am well aware that this is a very unconventional approach. That being said, the requirements of the project justified the means. While there may be many other ways to accomplish your goal, this does work. I am not going to go into extraneous details with respect to my particular project, but hopefully this will help somebody in the future. The primary problem with my original question was the way I was attacking the rendering sequence.
My initial approach from above looked like this:. All I've done is wrapped the entirety of my chatbox elements inside a single placeholder, dynamically creating HTML elements that wrap ASP controls all from the server and posting it as a "chunk" of dynamic data. This sidesteps some strange behaviors with ASP control placement otherwise, and allows for a quasi-OO approach for the client-side functionality of my project. An example would be posting a message received from a database notification to my chat window ChatBoxesLiteralMid control when it is received.
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