Regarding the column in table control

Hi all,

I am developing the table control in module pool.User needs to use table control to enter the data in it manually and store it in the database.

the table control has following  fields for example :

SR NO       NAME       PLACE       CITY

    1            AAA          BBB            CCC

    2            DDD         EEE            FFF

    3            GGG         MMM           PPP

The requirement is  the serial no. column in the table control should be filled automatically by default like 1,2,3 and so on.....and the user wants just to fill the remaining details like name,place and city without modifying the serial no.

The user should not be allowed to modify the serial no. and also when user presses insert button, the new row inserted should have the appropriate serial.no filled automatically.

please help me with the required code and where to write it in my module pool.

please request you all to provide me solutions on this.

Thanks in advance for ur help...

Regards,

Akil syed.