.Net Serialization change the class name without breaking saved files

hi
I have app with class called say "MyClass"
I want to change it to say "MyClass123"
Problem is that there are saved files that are serialized to have "MyClass"
How do I handle this - I want to rename class but still all files to open

Thanks
rwallacejAsked:
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CodeCruiserCommented:
Creating a new class instead of renaming would be one option.
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rwallacejAuthor Commented:
the saved files will have lots of
<MyClass> items

so
<MyClass123> won't be found

I need to rename class to MyClass123 BUT still be able to read serialized files with <MyClass>  
(I don't mind if the serialized files have <MyClass> in them and not newer MyClass123

reason...the original class name wasn't good / clear so want to change it
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Tony O'ByrneSenior Web DeveloperCommented:
The MSDN also gives examples of serializing with a specified filename.  Being able to specify the filename explicitly like this would mean you can change things as much as you want later down the road.

http://msdn.microsoft.com/en-us/library/58a18dwa(v=vs.110).aspx
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rwallacejAuthor Commented:
tried

    <XmlRoot(ElementName:="xxx")> _

and

    <XmlRoot("xxx")> _

but this didn't work.
the saved files still have the class name / Filename - they don't have the <xxx> specified
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rwallacejAuthor Commented:
got it thanks, I was mixing variable names and class names
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