This article provides information regarding error message "Operation is not valid due to the current state of Object" and how to resolve it.
This article applies to MachPanel build v5.3.10.
Problem 1:
Exception Details: System.InvalidOperationException: Operation is not valid due to the current state of the object.
System.Web.HttpValueCollection.ThrowIfMaxHttpCollectionKeysExceeded() +4198799
Problem 2:
Sys.WebForms.PageRequestManagerServerErrorException: Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 500
- Open Web.Config from Control Panel Website (located at: C:\Program Files\MachSol\MachPanel Control Server), and find <appSettings> key in it.
- Write following key under that section: <add key="aspnet:MaxHttpCollectionKeys" value="100000" />
For example:
Code Snippet
<appSettings>
<add key="aspnet:MaxHttpCollectionKeys" value="100000" />
</appSettings>
The new default max introduced range of ASP.Net HTTP Collection keys by the recent security update is 1000.
Reference URL(s) of Tested Solution:
http://stackoverflow.com/questions/8832470/operation-is-not-valid-due-to-the-current-state-of-the-object-error-during-pos
http://stackoverflow.com/questions/8684049/asp-net-ms11-100-how-can-i-change-the-limit-on-the-maximum-number-of-posted-for