I have one VS solution in which there are 20 custom web part is there and it is working fine in production environment as well.
Now because of some business requirement I have changed DLL version of that Visual Studio solution and deployed updated WSP file to SharePoint server.
Now all the web part get stopped working with following error:
Part Error: A Web Part or Web Form Control on this Page cannot be displayed or imported. The type [Namespace], Version=18.104.22.168, Culture=neutral, PublicKeyToken=6b79829b0b76e944 could not be found or it is not registered as safe. Correlation ID: ca46d29d-7206-a0a6-8e9d-63e88de320b1.
I checked root cause and found that all the page's web part is still pointing to old dll version of my solution but it should point to new version.
Now I can solve issue by adding safe control entry of old dll version to web config but which I don't want because If I will do that then my all web part will point to old code.
I have approx. 200 pages in SharePoint.
Please suggest me how can I fix that issue?