Guys if you have a crush on a girl coworker how do you show it?

At my job we all work different days in office and mostly work remote. There is this guy coworker who i believe likes me, also unsure. We rarely see each other, recently he lingered and made small talk, the next time I saw him we both had eye contact and smiles. The next day he acted all shy and awkward as I was asking him a question about work matters. The last 2 x he asked me questions he should know the answer too, " do I dial 9 then 1 to fax?"

Guys if you have a crush on a girl coworker how do you show it?
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