The NameMapping (I'm assuming that's what you mean by "name space") does not store the live properties of the application under tests. It simply stores what properties and methods are available (if you have the option enabled to do so).
If you want to see what's actually in the screen, use the Object Spy tool to select the table on screen and examine the property set. Or, you can go to the Object Browser and find your table that way. Either way, the RowCount property will display the actual rowcount for your table...
