Could you please let me know how do I calculate the current size of the table header?
Reason for this question is How to ensure that table header size is not crossed when we choose the table for MVC.
Your best bet is to use the 'file system info' macros- look here.
The key macro (i.e. the one that generates data) is the PopulateFsysinfo macro. Using the SHOWBLOCKS option with a 'display opt' of M should give you what you want. The table header is always sub-table 0 for any tabel that you define.
Have a look at the manual and try it to see what it shows you.