How to Resolve the Error : Operation is not valid due to the current state of the object.

I have got an error when i bind multiple records for input.

I bind Gridview inside Datalist to form a matrix like input which will update the value. my form is successfully running at localhost; but when i run it on my webserver it give me this error.

Operation is not valid due to the current state of the object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.InvalidOperationException: Operation is not valid due to the current state of the object.

Source Error: 

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace: 


[InvalidOperationException: Operation is not valid due to the current state of the object.]
   System.Web.HttpValueCollection.ThrowIfMaxHttpCollectionKeysExceeded() +2420862
   System.Web.HttpValueCollection.FillFromEncodedBytes(Byte[] bytes, Encoding encoding) +58
   System.Web.HttpRequest.FillInFormCollection() +159

[HttpException (0x80004005): The URL-encoded form data is not valid.]
   System.Web.HttpRequest.FillInFormCollection() +217
   System.Web.HttpRequest.get_Form() +104
   System.Web.HttpRequest.get_HasForm() +9038959
   System.Web.UI.Page.GetCollectionBasedOnMethod(Boolean dontReturnNull) +97
   System.Web.UI.Page.DeterminePostBackMode() +69
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +135

i have set MaxHttpCollectionKeys value in webconfig file like this, but nothing happen.

<appSettings>
    <add key="aspnet:MaxHttpCollectionKeys" value="5001" />
</appSettings>

Please, give me solution for this query.

Tags: C#, WebForms, ASP.NET, Gridview