Losing viewstate values when the request changes between the load balance servers

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Hello

I got an issue with loadbalancing.

I use a website which has two servers to maintain the load balancing.
I use view state values through out my website.When the request changes from one server to another server, i am losing the viewState values.

If i am in a form filling up some details, If the request processed by same server, I can go through everything with out any problem But if the request shifted to other server it popping up the error that the variable missing error(something called input string)

How to solve this proble. Please help me guys.
How to keep track of the viewState, even if the request shifts between servers.

Thank you ...

Posted 22-Dec-10 23:05pm

shekhardumala

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senguptaamlan 23-Dec-10 5:18am

Have you customized the view state store ...I mean is the view state is getting stored in the HTML of the page or you are maintaining somewhere else??

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Al-Farooque Shubho · Accepted Answer · 2010-12-22T23:17:00

Solution 1

You need to use the same MachineKey for all LoadBalanced servers (Either in the web.config, or, machine.config file). Otherwise, ViewState will cause problem in case of LoadBalanced deployment of Asp.net applications.

See http://wiki.asp.net/page.aspx/1248/aspnet-and-load-balancing/[^] for more.

There are a few other alternative approaches (To use ViewStateMac property). See following:

http://www.c-sharpcorner.com/uploadfile/gopenath/page107182007032219am/page1.aspx[^]

Hope, this helps.

Posted 22-Dec-10 23:17pm

Al-Farooque Shubho

Updated 23-Dec-10 3:03am

v2

Comments

Ankur^\m/ 23-Dec-10 5:31am

Correct!

shekhardumala 23-Dec-10 5:34am

Thank you for your responce.

I will try it and get back,If it works fine.

Thanks a lot.

sjelen 23-Dec-10 8:57am

Correct about ViewState, this also applies to anything using encryption (like EventValidation).
However MachineKey does not have anything to do with Session. Setting up session in a web farm is complete different problem (you can not use in-proc sessions).

Al-Farooque Shubho 23-Dec-10 9:00am

Yes, answer corrected. Thanks for the feedback.