Operation is not valid due to the current state of the object error during postback

Question

I had an aspx page which was working well  but suddenly I am getting the error  Operation is not valid due to the current state of the object   whenever a postback is done   The stack trace is      at   System Web HttpValueCollection ThrowIfMaxHttpCollectionKeysExceeded     at System Web HttpValueCollection FillFromEncodedBytes Byte   bytes    Encoding encoding  at System Web HttpRequest FillInFormCollection     Can someone help

User · Accepted Answer

Somebody posted quite a few form fields to your page. The new default max introduced by the recent security update is 1000.

Try adding the following setting in your web.config's <appsettings> block. in this block you are maximizing the MaxHttpCollection values this will override the defaults set by .net Framework. you can change the value accordingly as per your form needs

<appSettings>
    <add key="aspnet:MaxHttpCollectionKeys" value="2001" />
 </appSettings>

For more information please read this post. For more insight into the security patch by microsoft you can read this Knowledge base article

User · Answer

I didn t apply paging on my gridview and it extends to more than 600 records  with checkbox  buttons  etc   and the value of 2001 didn t work  You may increase the value  say 10000 and test    lt appSettings gt   lt add key  aspnet MaxHttpCollectionKeys  value  10000    gt   lt  appSettings gt

User · Answer

If your stack trace looks like following then you are sending a huge load of json objects to server  Operation is not valid due to the current state of the object       at System Web Script Serialization JavaScriptObjectDeserializer DeserializeDictionary Int32 depth      at System Web Script Serialization JavaScriptObjectDeserializer DeserializeInternal Int32 depth      at System Web Script Serialization JavaScriptObjectDeserializer BasicDeserialize String input  Int32 depthLimit  JavaScriptSerializer serializer      at System Web Script Serialization JavaScriptSerializer Deserialize JavaScriptSerializer serializer  String input  Type type  Int32 depthLimit      at System Web Script Serialization JavaScriptSerializer DeserializeObject String input      at Failing Page Load Object sender  EventArgs e       at System Web Util CalliHelper EventArgFunctionCaller IntPtr fp  Object o  Object t  EventArgs e      at System Web Util CalliEventHandlerDelegateProxy Callback Object sender  EventArgs e      at System Web UI Control OnLoad EventArgs e      at System Web UI Control LoadRecursive       at System Web UI Page ProcessRequestMain Boolean includeStagesBeforeAsyncPoint  Boolean includeStagesAfterAsyncPoint    For resolution  please update your web config with following key  If you are not able to get the stack trace then please use fiddler  If it still does not help then please try increasing the number to 10000 or something   lt configuration gt   lt appSettings gt   lt add key  aspnet MaxJsonDeserializerMembers  value  1000    gt   lt  appSettings gt   lt  configuration gt    For more details  please read this Microsoft kb article

User · Answer

For ASP NET 1 1  this is still due to someone posting more than 1000 form fields  but the setting must be changed in the registry rather than a config file  It should be added as a DWORD named MaxHttpCollectionKeys in the registry under   HKEY LOCAL MACHINE SOFTWARE Microsoft ASP NET 1 1 4322 0   for 32-bit editions of Windows  and  HKEY LOCAL MACHINE SOFTWARE Wow6432Node Microsoft ASP NET 1 1 4322 0   for 64-bit editions of Windows

[asp.net] 'Operation is not valid due to the current state of the object' error during postback

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