I have seen two solution of the "The form cannot be displayed because session state is not available." error while loading an InfoPath form in XMLFormView Control. One is a change in web.config file. Lot of people do not recommend this change. The second
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Here is a nice article about using an XmlFormView Control A browser-enabled InfoPath form template is functionally equivalent to a form designed to run in Microsoft Office InfoPath 2007, but when it is published to and opened from a server running InfoPath
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