Convert to number without losing zeros VB

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VB

Hello there.

Is there a way to maintain the format of a number in this form:

00238
00250

Initially those numbers are a string in the project and they are saved as varchar in my database, but I need to generate a consecutive serial from those two, to achieve that I pass the numbers to int, but with this the leading zeros are obviously removed.
Is just to clear my curiosity about it, I already save all the serials into the database with the leading zeros but I made this taking the length of the original string and making a comparison of the serial generated with the original.

Thanks in advance