how can I set the no. of row of repeater by default

I would like to set the row number to 5, that mean when the page is load, the repeater has 5 rows by default.
if the retrieving record less than, then the remaining row will be blank
if the retrieving record is equal to 5, then all the row will be filled.
if the retrieving record more than 5, then the repeater will grow according to the no of record that retrieved.

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