It is the base class for all the exceptions that are thrown from NCache. So you can catch this exception for all the exceptions thrown from within the NCache.

[SerializableAttribute]
public class CacheException : Exception

<SerializableAttribute> _
Public Class CacheException _
	Inherits Exception

[SerializableAttribute]
public ref class CacheException : public Exception

try
{
    ...
}
catch(CacheException ex)
{
    ...
}