Passing Variables to Crystal Report at Run time

I'm running Crystal Report. I want to pass some variables to it at run time, like date between certain period. I mean I want Crystal Report to prompt me for the variable. How can I do this? I'm using version 8.5

In Crystal, you setup/create a Parameter Field. Use the Insert -> Field Object menu command. In the Field Explorer dialog, click on the Parameter Fields item and click the New button.

You can then use parameter fields whereever you need them in your report, for example the record selection formula.

When you run the report from within VB, Crystal will automatically prompt for the parameter(s) using its default dialog box.