This kind of testing is constructed based on the functions that are using the standard web-form keystrokes. You typically load data from a table with variations and combinations of values that are expected from a typical source.
You can do this manually, of course, but this is one of those applications that should be reviewed as a candidate for automation because you use the input form really to test the functionality that uses the data submitted via this form, which can require a lot of variations and combinations.
I am sorry I upset you, Priya, but I think it is rude for people to be too lazy to enter properly formulated questions and yet to display the gall to include "please respond as soon as possible would be appreciated" in their post. As Joe said above, I was trying to make a point in good humor that if he cannot bother to ask a proper question then why should he expect anyone to make an effort to respond.