Return number of rows

Hello:

I am processing an excel sheet which contains 5 columns..

There may be any number of rows in this excel.

I am trying to figure out how I can get the number of rows that are
populated in this excel sheet.

Can someone please help me out.

Eg.

Index LastName FirstName DOB

1 Test1 Name1 XXX

2 Test2 Name2 XXX

3 Test3 Name3 XXX

4 Test4 Name4 XXX

Number of rows should return 4.

Thanks in advance!

Aruna