Like in asp.net you save items in viewState, is there similar function with windows form?

No, why would there be? Pages are destroyed in ASP.NET applications after the server renders the page. Object states are stored in the viewstate so on a postback the page can be recreated. Now with windows forms the objects are never destroyed until you destroy them. What do you need a viewstate for? Save the form's state or don't destroy it.

Thanks Scott, I was trying to save the form's state and call the value from another class.
As a work around, I just place all the methods in the form class

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