If this application is hosted by a Web Farm or cluster, ensure that configuration specifies the same validationKey and validation algorithm By default DNN does not use autogenerate keys, so to rectify this the machinekey node from web. Note, you will still need to ensure your webfarm is using the relevant Caching Providers This message can occur for a few other reasons: DNN implements cross-site request forgery protection via the viewstatekey setting in asp. This means that any postbacks to a site are checked to ensure they come from that site, and are not "cross" posted from another website.
As these checks use the viewstate key's, if the application recycles and the values change this can cause the error. This most commonly manifests when a user has left the site idle for a period of time greater than the app recycle by default 20 minutes , or an operation on the site has caused an app recycle e. This protection was added in 5. Unfortunately as the failed viewstate is caught early in the asp.
Note: this exception also commonly occurs when automated security scanners are used against a DNN site as they will test posting content to pages.
This is safe to ignore. If a postback event occurs whilst a slow-loading page is still loading this can happen e. This is caused as the viewstate value was added as the final value in the page in earlier versions of. Upgrading to. It's also recommended that page sizes are kept as small as possible. Occured in DNN 6. On rare occasions the viewstate issues are isolated to a internet explorer browser. As IE can cache webpages, a cached copy of a page may contain an "old" viewstate key.
Microsoft lists a number of other possibilities Note: the 6. Further references Truly understanding viewstate Understanding viewstate Encryption Viewstate encryption is a best practice and a good way to provide an additional level of security a defence in depth approach.
All the records are fetched for each and every page in the Datagrid. Meaning that if you have records in the database and you are using paging. Each time you click to go to the next page you retrieve records.
This is way too much performance kill. That's why for this task we can use Data Caching, let's see how we can use data caching to make our application more efficient. The above example is pretty much simple and as you have also noticed that the syntax for using Data Caching is very similar to the ViewState object. By using this technique you will only get the data from the database if the Cache is empty.
And if you see the page source you will not find any hidden fields since Cache is stored in memory rather than in page source. Another good thing about Cache object is that it is accessible throughout the application.
When it comes to choosing between ViewState and Caching it all comes down to what you are doing. ViewState is an ideal candidate if you are planning to save small values. Mostly values of server controls are saved in ViewState. If you plan to store large datasets, datatables or collections than data caching is an excellent candidate.
Home Articles. Improve this answer. As per documentation: View state is used automatically by the ASP. Shree Shree If you want to persist the values after postback also than ViewState is the best option.
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