Compare 2 list boxes and write to file

Hi All,

I am new to VB6. I have created code to add data in 2 list boxes. List 1 has values A B and C

List 2 has values A, D, E, F

I should compare List 1 with List 2 and write only values unique to List 1 (B and C) into a test file. Can you guys suggest me a way to do it.

Thanks,
Raghav