>It will occurs error, when I choose line of 253 in combo box (Visual Fox 5.0).
>Do you have any resolve of this to prevent this problem. Thanks

Dzuan,

Two possible solutions, don't have more than 252 items in your combos, or upgrade to the latest version 6.0 SP3.

The bug you are getting is a known issue with the intial release of VFP 5.0. If you search the Microsoft vfoxpro site you may find patches for 5.0.