Collating Sequence (no replies)

looking at my data in MYSQL Workbench I see data in the following sort order:

aaaa
ac-2900
ac-45
ac100
ac100-10

In my VB.Net Program, my grid bound to Mysql database shows same table data sorted as:

aaaa
ac100
ac100-10
ac-2900
ac-45

Why the difference in collating position of "-"?

According to ASCII Chart, the character sequence is: - . / 0 1 2 3

Curious!

Lee