Hi, This problem can also be caused by the not valid viewstate - after what time you hit the next button? It is possible that the session already expired and the viewstate was no longer valid on the server. Best Regards, Juraj Ondrus

Thanks Michal...after enabling the viewstate...code is working fine

Hi This problem keeps me from publishing the whole site - any news? Thanks, Mike

Hello, This issue is caused by the fact, that the user control is loaded dynamically too late. Please edit webpart 'usercontrol.ascx' in the folder ~/CMSWebParts/General, find this code: public override void OnContentLoaded() { base.OnContentLoaded(); ...

Hi Ralph, basically you can disable viewstate for webparts which doesn't produce dynamic data,you can refer to this article(Disable viewstate). You can find there brief description, if you're not sure you can give a try and see what will be produced as output of webpart. ...

Hi Henry, Could you please try to follow suggestions described in 'Timeout with error msg: Validation of viewstate MAC failed...' article? Best Regards, Martin Dobsicek

Well that may be true but in this case if an option is selected the page redirects so forgetting the selected item is not important. As for loading dynamically it's fine if you load the items before Viewstate is turned as .net automatically reselects the correct item by que...

Hello, I believe the root cause will have something to do with the viewstate not being loaded correctly or not being allowed to load, since the Sitename is loaded directly from the viewstate. Can you please check your web.config file to ensure you aren’t disabling the view...

Am facing this issue and I found event log like this I added in below. Message: Exception of type 'System.Web.HttpUnhandledException' was thrown. Exception type: System.Web.HttpUnhandledException Stack trace: at System.Web.UI.Page.HandleError(Exception e) at System.Web.UI...

Upgraded from 10 to 11, when I try to view the site locally https://localhost:44349/ I get a message: Either the website is stopped or the requested domain name is not configured for any website: https://localhost:443/ If you're an administrator of this site, you need to go t...