I recently read this article in MSDN blogs Design Guidelines Update:
Exception
Throwing(http://blogs.msdn.com/kcwalina/archive/2005/03/16/396787.aspx)
and this prompted me to finally review how Aspose.Word throws
exceptions.
I must say I agree with everything what Krzysztof says in that article
and I was actually doing exactly that for ages in my C++ and Delphi
projects long before .NET. Of course that was raising some eyebrows from
many developers whom I used to work with, but I knew it would come out
right in the end.
So the review of Aspose.Word exception handling revealed that there is
really not much to change. Aspose.Word always used to consistently throw
exceptions mostly using the appropriate exception classes already
defined in the .NET framework. I just tidied up in a few places and I
now can document it as a policy, effective from Aspose.Word 3.3 due to
be released soon.
1. Aspose.Word throws an exception when a method cannot complete the
operation it is designed to do.
2. When an invalid argument is passed to Aspose.Word, an exception
derived from ArgumentException is thrown. In some cases (for example
when a string cannot be null and cannot be an empty string) an instance
of ArgumentException itself is thrown. Ideally, argument exceptions
should only be thrown if you pass an invalid argument into one of the
public methods so the message makes it clear you are trying to do
something wrong. However, there are many more internal classes in
Aspose.Word than public and the internal classes also throw argument
exceptions and in theory there could be a situation when you get an
ArgumentException, but you did not pass that argument into a public
method. This should not normally happen, it would be a bug in our code
if it happens.
3. When you call a method of Aspose.Word and the operation cannot be
completed in that particular current state, an InvalidOperationException
will be thrown. For example, trying to insert a cell while table and row
were not created in DocumentBuilder.
4. The NotSupportedException is thrown when you try to engage one of the
features not supported by Aspose.Word. For example, import from HTML
some constructs that are not yet supported (for example many CSS
features) or try to open a document in pre-Word97 format.
5. Aspose.Word defines one exception class PleaseReportException. This
is a specific of the way we work with the binary DOC format. Big chunks
of the DOC format are not documented and we sometimes cannot be sure if
a particular condition or situation can occur in a document in real life
or not. Whenever we detect such a condition in code and think it is
safer to stop processing and make the situation vivid instead of
silently ignoring it and potentially creating problems, we do that. The
idea is that when you see a PleaseReportException, you post the error
message in the Aspose.Word Support Forums and attach the problem file.
This will help us to quickly learn a new undocumented thing about the
DOC format and release a hotfix that processes that file okay.
6. Some other standard exceptions defined in .NET are also thrown by
some methods, for example FileNotFoundException, CryptographyException
when failed to find or decrypt a license file etc.
7. All exceptions that can be thrown by the public methods will
gradually be fully documented in the API reference.
8. We will provide more "tester" methods in the public API so you can do
things with a check as opposed to throwing an exception. These methods
will only be added where really needed. For example at the moment
DocumentBuilder.MoveToMergeField throws if a field is not found in the
document. We will provide a way to first detect if there is such a merge
field in the document before moving to it. Please feel free to submit
suggestions about what operations do you think should be possible
without throwing.

For more info please check:
http://www.aspose.com/community/Blogs/roman.korchagin/archive/2005/11/02
/35002.aspx

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