Adding data to listview columns


I am having some trouble adding data into the list-view after creating it in the Windows Form Designer.

The goal is to input data from a hashtable. I currently have 2 columns created however I can’t seem to figure out how to pass the hash.key and hash.value into collumn1 and collumn2. The end result should look something like this
Collumn1 | Column2
hash.key1 | hash.value1
hash.key2 | hash.value2

Any help would be very much appreciated, thank you!