What is the recommended C# DataType for holding credit card information?

If I just encrypt a string with a credit card number, the old unencrypted one is still hanging around for a bit until it’s garbage collected. The encryption is written to a new copy. The same issue arises if we try to overwrite the old string when done with it, i.e. the original string becomes unreferenced and new string is created for the overwrite.

I did wonder about SecureString but this discussion seems to identify issues with it:

What is the recommended way of holding credit card details in C#?
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AndyAinscowFreelance programmer / ConsultantCommented:
I'd suggest using arrays of characters - then you can overwrite the characters with different ones when you don't require them any more.

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purplesoupProgrammerAuthor Commented:
Apparently there are issues with character arrays getting swapped to disk - but no one else answered so you can have the points.
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