How to get the individual dates between two dtpicker

:confused::confused::confused:
I am doing a project on the topic car rental system. i am a student without much knowledge about vb. i need to set a car that are previously booked as unavailable depending on the date selected by dtpicker, whereas booking are taken for many days tooo. so there is 2 dtpickers(from date and to date) that select the dates which the customer needs the car. how to mark that the car is not in between the two dates selected previousely. i am using sql server 2005as backend. i cannot move further without knowing these.
help me plsssssssssss

thanks in advance.