Upgrading from 2013.3 to 2021

[Hilik Yaniv]

hi,

we are using Telerik UI ASP.NET AJAX version 2013.3 and we would like to upgrade to the latest version.

how tough it will be?

 

what difficulties we should expect?

 

thanks

 

[Vessy]

Hi Hilik,

8 years is a pretty long time and we have implemented many features and bug fixes during that time. In case you are using custom skins, customized dialogs, overrides of functions, etc. - they will most probably need to be updated.

Basically, the easiest way to upgrade your project to the latest version of the controls is to follow the instructions from the following help article:

https://docs.telerik.com/devtools/aspnet-ajax/installation/upgrading-instructions/upgrading-a-trial-to-a-developer-license-or-to-a-newer-version#upgrade-to-a-newer-version-of-telerik-ui-for-aspnet-ajax

Before starting an upgrade of your project, you may find it useful to review the following resources:

• The Known Issues and Important Changes sticky thread. It lists changes that may affect your code and known regression issues (that are usually fixed in the subsequent release). Review the information for the releases you go through so you can evaluate whether you will be affected by anything.
• The Telerik Upgrade API Analyzer can analyze your C# code to notify you of changes between your version and the new version you want to upgrade to. It offers information as of the Q1 2012 (2012.1.225) release.
• UI for ASP.NET AJAX Release History—reviewing the release notes for all releases you go through will let you see what has changed, what fixes, features and controls have been implemented so you are better prepared to meet your project's challenges.

Please, keep in mind that the controls come with several render modes now and the Classic one is put in maintenance mode, so we would advise that you switch to Lightweight rendering:

https://docs.telerik.com/devtools/aspnet-ajax/controls/render-modes

Regards,
Vessy
Progress Telerik