Hey Ganapati,
Why don't you simply put the username and password into your sheet (for all the rows you want to itterate over)? I assume (from what you describe) that this is the case since it's read for the first record.
If that does not solve your problem, (and there are probably more elegant ways to do this), but you can merely assign your username and password (or whichever values you wish to remain static) to a variable outside the datadriven loop. The values that are set will then remain the same (until of course you change them).
Regards,
Altus
