Continuous display of records with trackbar

Question

I have array of 10 records. I select the records sequentially with trackbar and display it on win form after thmer_Tick. I want the records to display continuously until I manually stop it but after the 1oth record, it will skip the first record, throw exception(index was outside the bounds of the array)  and continue the display with the second record. How do I select the first record immediately after the last record?
Thanks