use disposable code for register

hi
1-i want get to my users 5000 disposable code before register and them can register if have the code and i want other user can't register in my website.only who has a code can register in my website and each code can use for 1 time.
is it possible with cb? (i get the code to them physically through face to face meeting).
2-can i use some logic in that code? for example 0123456789 ==> 01 means his twon, 23==>age, 45==>his school, 67....
3-and how many user can register in joomla? for example if i have 100000 user, can them register in joomla via cb? need to note to something for this heavy number of users?

1-i want get to my users 5000 disposable code before register and them can register if have the code and i want other user can't register in my website.only who has a code can register in my website and each code can use for 1 time.
is it possible with cb? (i get the code to them physically through face to face meeting).

You could use CB Invites for this then simply set the invite code field to be required and displayed on registration. Then you can invite them to join via email address. Only those invited will be able to register. Your alternative is probably a combination of CB Auto Actions (for marking the code as used via Query action) and CB Query Field with its Query Validation to validate a code against your custom database table where you'll store those disposable codes.

2-can i use some logic in that code? for example 0123456789 ==> 01 means his twon, 23==>age, 45==>his school, 67....

For CB Invites, no they're generated. For your own custom usage you can use whatever you want.

3-and how many user can register in joomla? for example if i have 100000 user, can them register in joomla via cb? need to note to something for this heavy number of users?

There is no limit. We've 559,669+ registered here on Joomlapolis.

krileon wrote: Your alternative is probably a combination of CB Auto Actions (for marking the code as used via Query action) and CB Query Field with its Query Validation to validate a code against your custom database table where you'll store those disposable codes..

thank you krileon but i'm very afraid about using CB Auto Actions+Query Validation for lowing speed and high pressure on server,because i have 50,000 disposable code and until the query can find that data, maybe very late and after that until auto action work , it maybe take a lot of time.
1-can give me a sens about that speed in this size?:
1000user register in day+50000 disposable code + use CB Auto Actions+Query Validation
i must use my own host and can't transfer my host to any other.
2-is it need to use some plugin such as jchoptimize for better performance and speed up or cb have any speed up way or additional plugin?

Ensure the table is optimized with indexes and run EXPLAIN tests on your query directly in phpmyadmin to ensure it's using the indexes and you won't have any performance issues whether you have 50,000 disposable codes or 1 million even.

2-is it need to use some plugin such as jchoptimize for better performance and speed up or cb have any speed up way or additional plugin?

JCH Optimize is used to speed up page header performance. It compiles JS/CSS header files together and caches them. It then further improves performance with lazy loading of images (basically ajax loads them in after the DOM finishes). It won't help with SQL or PHP performance.