Invalid viewstate error using dynamic controls asp.net c#

Question

In asp.net web application, we are using dynamic controls in asp Table and other static controls.while navigating between forms or postabcks, We

are facing an intermittent issue "Invalid Viewstate".

Error Message:Invalid viewstate.

Client IP: 27.251.48.180

Port: 8968

Referer: http://50.193.80.10/wfmtest/DailyErection.aspx

Path: /wfmtest/DailyErection.aspx

User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:39.0) Gecko/20100101 Firefox/39.0

ViewState:

/wEPDwULLTEwOTMwMDU5MDYPZBYCZg9kFgICAw9kFgQCAw8PFgIeBFRleHQFEkJhcmNsYXkgRGF2aWQgVHJveWRkAhEPZBYCAgMPZBYCZg9kFhICAQ8PFgIfAAUKMDctMjgtMjAxNWRkAg0PE

A8WBh4NRGF0YVRleHRGaWVsZAUHSm9iRGVzYx4ORGF0YVZhbHVlRmllbGQFA0pvYh4LXyFEYXRhQm91bmRnFgIeCG9uY2hhbmdlBQ9TaG93UHJvZ3Jlc3MoKTsQFbMBAA8wMS0wMDAgLSBvZm

ZpY2UnMTItMTY1IC0gTm9ydGggJiBQdWxhc2tpIFNlbmlvciBIb3VzaW5nITEyLTE4NCAtIFNhbmdhbW9uIFRlcnJhY2UgU3IgQXB0cx8xMy0xMjggLSBWZXRlcmFucyBOZXcgQmVnaW5uaW5

nFDEzLTEzNyAtIFBpbm5hY2xlIDE2HTEzLTE0MyAtIFRhcGVzdHJ5IEdsZW52aWV3IFBEJjEzLTE2MCAtIEFsZGkgLSBPYWsgQ3JlZWsgV0kgRXhwYW5zaW9uJTEzLTE2MSAtIFVuaXYgb2Yg

Q2hpY2FnbyAtIFNydmNzIEJsZGcaMTMtMTY5IC0gQ2xvdmVyaGlsbCBCYWtlcnkaMTMtMTcwIC0gSGFycGVyIENvbGxlZ2UgUEQmMTMtMTcxIC0gTEEgRml0bmVzcy81NTAxICYgNTYwMCBLZ

WR6aWUdMTMtMTcyIC0gU2FnZSBZTUNBIC0gQmxkZyBBZGQnMTMtMTc0IC0gVG95b3RhI...

Source:

StackTrace:

From the forums, we found few solutions which we changed in web.config file as shown below,

<system.web>

<compilation targetFramework="4.0" />

<httpRuntime executionTimeout="420" maxRequestLength="53248" useFullyQualifiedRedirectUrl="false" />

<authentication mode="Forms">

<forms timeout="600" />

</authentication>

<sessionState mode="InProc" cookieless="false" timeout="560" />

<customErrors mode="On" defaultRedirect="errorPage.aspx" />

<pages enableEventValidation="false" enableViewState="true" enableViewStateMac="false" maxPageStateFieldLength="-1"

viewStateEncryptionMode="Never" />

<machineKey

validationKey='C912F05687CC92785747C70F9241272CE8014BD69F5A3BE7A3A333C4F50FBC83A0398590CC0693AC9D8BEDDEB1EC118A58F8C1FFE090B0D89A020DC75EB9B05E'

decryptionKey='14EFA8EA4BBC435752DE13AB1995AF4A95795F0ECEEFB808' validation='SHA1'/>

</system.web>

Even after this change, we are still finding "Invalid Viewstate" error.

This is of high importance and please anyone help in resolving this issue.