very urgent , how to write the code ???

[Ah C]

hi, I have a vb.net form where i have to search . The user will enter from amount and to amount , and known Item code or i have added a check box to select all. Now how do i filter the result with entered amount or if the user selects all . Im using sql with vs08 , vb.net...............any help will be appreciated guys.
thanking in advance for your time and consideration,