error comes on server in web applicaion

Question

Hello Guys,

I uploaded my web application on server and its running well but some where it give below like error, so Give me solution if you have!

Server Error in '/' Application.

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Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

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.Web.HttpException: Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

Source Error:

[No relevant source lines]

Source File: c:\windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\root\96dfbac2\6d2c70a7\App_Web_tdltrter.0.cs    Line: 0

Stack Trace:

[ViewStateException: Invalid viewstate. 
	Client IP: 123.201.23.219
	Port: 10784
	User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:22.0) Gecko/20100101 Firefox/22.0
	ViewState: /wEPDwUJMjQyMDA4NTAwD2QWAmYPZBYCAgMPZBYCAgcPZBYCAgEPZBYGAgEPZBYCAgEPZBYCAgEPEGRkFgFmZAICD2QWAgIBD2QWAgIBDxBkZBYAZAIDD2QWAgIBD2QWAgIBDzwrAA0AZBgBBSNjdGwwMCRDb250ZW50UGxhY2VIb2xkZXIxJEdyaWRWaWV3MQ9nZJfEs+ErX8X48flsAyKsCTBwDbFC
	Referer: http://cmls.in/Admin/Default.aspx
	Path: /Admin/Default.aspx]

[HttpException (0x80004005): Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.]
   System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError) +106
   System.Web.UI.ViewStateException.ThrowMacValidationError(Exception inner, String persistedState) +14
   System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +237
   System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter.Deserialize(String serializedState) +4
   System.Web.UI.Util.DeserializeWithAssert(IStateFormatter formatter, String serializedState) +37
   System.Web.UI.HiddenFieldPageStatePersister.Load() +207
   System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +105
   System.Web.UI.Page.LoadAllState() +43
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +6785
   System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +242
   System.Web.UI.Page.ProcessRequest() +80
   System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) +21
   System.Web.UI.Page.ProcessRequest(HttpContext context) +49
   ASP.admin_default_aspx.ProcessRequest(HttpContext context) in c:\windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\root\96dfbac2\6d2c70a7\App_Web_tdltrter.0.cs:0
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +181
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75

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Version Information: Microsoft .NET Framework Version:2.0.50727.5466; ASP.NET Version:2.0.50727.5456              

Thanks .......

Answer 1

You may want to explore MVC/ WEB API/ Client side frameworks (angular etc.). As these have become should have skills for .net web developers

Answer 2

ASP.NET is said to be desinging side of web and you have mvs go for it and keep updating thats will do for you.

Answer 3

MVC and WCF are most important one.

Answer 4

Hi Rohan,

 

MVC is key technology, the use of both the technologies are for different requirements. But both are mostly require to use together.

 

Lets have hands on MVC first and then try WCF. 

Answer 5

Asp.NET MVC 6 is new. You should learn MVC.

Answer 6

In now days both are important for carrier growth.

 

and have knowledge of

 

Angular JS, node.js, KnockOut js

Entity Framework

WCF Services

WPF

WebAPI

 

Answer 7

ok Mr. Prasham Sabadra but wcf in best or mvc for me.

Answer 8

Hi Rohan,

 

Please have hands on asp.net mvc. MVC 5 is already there and asp.net vNext is in preview.

 

Lets have in depth understanding of MVC framework and then there are lots of supporting technologies like

 

Client side frameworks Angular JS, node.js, KnockOut js

Entity Framework

WCF Services

WPF

WebApis

 

Please let me if some more clarification required.

 

Answer 9

which type of new technologies 

Answer 10

Hi first know well basic concept in-depth and learn new technologies as well as touch with technical people in different organizations.