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...

Hi Juraj, here we go: Settings for site "www.vtx.ch", category "URLs and SEO" URL format -------------------------------------------------- Forbidden URL characters: Forbidden characters replacement: - Allowed URL characters: Friendly URL extensions: ...

If I put a checkbox (or any standard control) on a blank aspx page, and a button to postback, the value of the control is saved. This is pretty standard viewstate stuff. If I do exactly the same, but into a custom abstract (otherwise blank) webpart, the button posts back, bu...

Help me, i move up, move down node order in admin to error logout.

That's a good idea. But it has some issues. It isn't robust enough in some situations. I use the method from http://blogs.msdn.com/tom/archive/2008/03/14/validation-of-viewstate-mac-failed-error.aspx to fix a few other things. It is also more robust for when the ViewState is s...

Hi there I just discovered, that in version 4.0 you can disable the view state of every web part reducing greatly the size of the __VIEWSTATE input field by up to 90%! Now I am not a hardcore .Net developer and I am asking in what cases it is safe and in what cases it is...

I found a solution. It was related to ViewState. See here http://devnet.kentico.com/Forums.aspx?ForumID=7&Thread=00003435

Hi, Yes, the upgrade is recommended. However, the upgrade package is not available for the RC version. It will be published with the 4.0 final version. Best Regards, Juraj Ondrus