Asp.Net Error Message:Unable to validate data
- by Amitabh
We have a Asp.Net Webform page which contains a GridView inside UpdatePanel and refreshes every minute. And every one minute we get the following error in Event log.
Error Message:Unable to validate data.
Stack Trace: at System.Web.Configuration.MachineKeySection.GetDecodedData(Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Int32& dataLength)
at System.Web.UI.ObjectStateFormatter.Deserialize(String inputString).
We have tried the following.
Adding a static machine key in the Web.Config. (Did not work?)
Disabling the View State Mac in the Web,.Config using following entry. (Did not work)
<pages buffer="true" enableViewStateMac="false">
Is there something else that might cause this?