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Источник: http://sumitax.wordpress.com/2010/08...rprise-portal/
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I wrote a example about ViewState in one of earlier  post.  But while implementing ViewState in user control for Dynamics Ax2009 we need to  follow below steps:

1. In the Page_Load event we have to initialize the ViewState variables to make sure these variables are initalized.
2. The ViewState.Add method should be used in Page_PreRender event to add the desired variables in ViewState when page is rendered.

Источник: http://sumitax.wordpress.com/2010/08...rprise-portal/