Add unique Items to ListBox Dynamically

Hi Experts.

Please help me in following problem

I have a userform which contains a Combo List Box and a List Box.

In combo list box I have list of some products, like showing in coloumn C

I want when I select any item from combo list box then
List box load the list in list box only matched values in column C vs combo box.
List box should remove duplicates rows. Only show unique values.

Means every product have multiple rows with same value.
listbox should show the unique value.

I shall be very Thankful to you.

Amir