No sooner... than

[Unregistered]

Which is correct? If both are okay, what is the difference between them?
And I wonder if it is possible that 'no sooner' comes after subject.
Because I think this structure is a inversion and I wonder what the original sentence is before it is made a inversion.

①No sooner had I come into contact with him than I determined to get to know him well.
②No sooner did I come into contact with him than I determined to get to know him well.

Thanks in advance.

[Soup]

See The English Blog: Grammar Tip 11: As soon as/No sooner and http://www.helenstrong.de/log/attach.../inversion_pdf -


①No sooner had I come into contact with him than I determined to get to know him well.
②No sooner did I come into contact with him than I determined to get to know him well.