I am just starting with ASP.NET using C#. We are using the Microsoft sample application Duwamish as a model application for our organisation.<BR><BR>We have done very little customisation work on Duwamish apart from implement the latest Microsoft Exeception Management assemblies. <BR><BR>However I randomly get the following error from the home page when selecting the Add To Cart option from a pick of the day book. <BR><BR>System.Web.HttpException: The View State is invalid for this page and might be corrupted.<BR><BR>It doesn&#039;t always happen, and I cannot determine a pattern, although it is quite regular. Does anyone know why I get this error and how should I get round it please? <BR><BR>Thanks.<BR><BR>Leighton<BR>