if you want your module to run in older dnn versions, you should not include asp.net ajax features. Depending on the ajax features you need, you can use some of the client api features (like labeledit, textsuggest etc). The client api also supports custom callbacks, but it its a bit more work to make it all work together ...

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 I have deceided to target DNN version 4.5.2 and later. In this custom module I am developing in C# I am trying to convert an Ajax project built in non-DNN ASP.Net.

This code has a timer in the javascript that calls a callback. The callback doesn't seem to work and I am trying to figure out how to convert this to DNN Ajax. Here is the non-DNN C# code:

//Register Ajax client script to client's browsers. This has to be hard coded.

string cbReference = Page.ClientScript.GetCallbackEventReference(this,"arg","ReceiveServerData","context");

string callbackScript = "function CallServer(arg, context)" + "{ " + cbReference + "} ;"; 

 Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "CallServer", callbackScript, true);

 How would I replace this code to work in DNN Ajax?

Also could someone just hit the high points of what using 4.5.2 and later buys one in the Ajax world?