thank you, it's almost like what I thought to do.

>>That's just was I Did, what I want to implement was something which could check if the Data structeres had changed.
>>I thought to test if the exe program had changed but Is not sure that Data structure change with a new compilation of the Application...
>
>I think you want the program on the client machine to do the upgrade automatically, if there are changes, right?
>
>I think an easy and fast option would be to save information somewhere, in some table, about the "database version". If the client has database version #3, and you send him database version #4 or #5, then it is time to upgrade the database structure.