the application(using Xceed ZIP) is throwing Secuirty exception when deployed on a shared hosting like Crystaltech.its even not accepting the custom trust level i add to my web.config file.
Any help ??

You can look at the UNC Share Hosting section on this <a href="http://msdn2.microsoft.com/en-us/library/aa302436.aspx">page</a> from MSDN, which refer to <a href="http://support.microsoft.com/kb/320268">System.Security.SecurityException : Security error.</a>

This is most likely a web application configuration problem.

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André
Software Developer and Tech Support
Xceed Software Inc.