vb.net_beginner 0 Newbie Poster

I have linked a database to a windows form. I have dragged the field objects onto the windows form.

Prior to doing this I changed the first field object to a combo box and the last field object to a list item.

I have proceeded with the following settings for the binding by clicking the arrows on the relevant objects:

Combo Box:
Data Source = databaseBindingSource
Display Member = column1
Value Member = column1
Selected Value = none

List Box:
Data Source = databaseBindingSource
Display Member = column5
Value Member = column1
Selected Value = none

The Combo Box is working ok but the List Box is showing all the values in Column 5 I just want it to show the unique ones. I then need to be able to select a unique value from the List Box and it show all entries from column 1 that have the specified column 5 value against them.

I realise as I waffle this is not making much sense but any Ideas greatly received?