Support for ASP,NET server behaviors was removed from Dreamweaver in CS4. However, if you need to re-enable that functionality, it's included as an extension in the following folder: C:\Program Files (x86)\Adobe\Adobe Dreamweaver CS5\configuration\DisabledFeatures (Windows 64-bit - remove the (x86) for 32-bit). On a Mac it's in /Applications/Adobe Dreamweaver CS5/configuration/DisabledFeatures.

Use the Extension Manager to install the ASPNet_Support.mxp extension.

nickbush wrote:

 

why is it a deprecated functionnality ?

Only Adobe can give the official answer to that question, but there are several reasons in my view:

• Adobe needs to base functionality on stable versions of technology. Microsoft began developing new versions of .NET, which it released according to its own timetable, making it impossible for Adobe to keep pace.
• Microsoft incorporated support for ASP.NET in Expression Web, its rival to Dreamweaver. Rather than constantly trying to play catch-up, Adobe decided to cede that part of the market to Microsoft.
• In addition to dropping support for ASP.NET, Adobe has also removed the server behaviors for Classic ASP JavaScript and JavaServer Pages. Support remains for PHP, ColdFusion, and Classic ASP VBScript server behaviors, but they haven't been updated for many years. Instead, CS5 provides greatly enhanced support for third-party PHP frameworks and CMSs, such as WordPress and Drupal.

My reading of the situation is that server behaviors were considered a good idea at the time they were introduced, but they seem destined to follow the fate of the JavaScript behaviors, which have been overtaken by third-party frameworks, such as jQuery.

By deprecating the ASP.NET server behaviors, but leaving them as an extension, Adobe is saying that you're welcome to continue using them; but there's no guarantee that they'll still work, because they're no longer actively maintained.