Adding item into listview1 and remove if the item has already in the listview1 or replace - vb.net

Question

I have listview1 with 2 columns. I already have a code for adding items but my problem is when I add again the same item in listview1, it shows duplicates and when I continue to add the same item, the items in listview are increasing with same data.
Example for what I need:
When listview1 has already a data in 1st column = 1 and in 2nd column = A, and I want to add again with a data like these 1st column = 1 and in 2nd column = B. I have 2 solutions and I try to code it but with no luck. My 2 solutions is these:
I just want to update only the data in 2nd column, from "A" to "B" but with the same 1st column data and no additional item will be added into listview like nothing just update/replace it.
OR
Remove the item that will cause duplication and add the same item so there will be no duplicates.
Here's my code for adding item:
Private Sub rbChoiceA_Checked(ByVal sender As Object, ByVal e As EventArgs)
Dim rbA As RadioButton = TryCast(sender, RadioButton)
Dim str As String = rbA.Parent.Name
str = str.Remove(0, 6)
lab1.Text = str
Dim item As ListViewItem
Dim row As String() = New String(2) {}
row(0) = str
row(1) = rbA.Text
item = New ListViewItem(row)
ListView1.Items.Add(item)
End Sub
I just need help to add the code for my problem. Your answers is highly appreciated. Thanks in advance!

Answer 1

Find the item before add it
If (ListView1.FindItemWithText(row(0)) Is Nothing) Then
ListView1.Items.Add(item)
End If

Answer 2

I just figured it out because of others help also.I created a function as Dictionary.This code is updating the subitem without adding or deleting item.
Dim thisDict As New Dictionary(Of String, String)
Public Sub listviewupdate(ByVal D As Dictionary(Of String, String))
ListView1.Items.Clear()
For Each KVP As KeyValuePair(Of String, String) In D
Dim LVI As New ListViewItem(KVP.Key)
LVI.SubItems.Add(KVP.Value)
ListView1.Items.Add(LVI)
Next
End Sub
Private Sub rbChoiceA_Checked(ByVal sender As Object, ByVal e As EventArgs)
Dim rbA As RadioButton = TryCast(sender, RadioButton)
Dim str As String = rbA.Parent.Name.Remove(0, 6)
lblItemNo.Text = str
If thisDict.ContainsKey(str) Then thisDict.Remove(str)
thisDict.Add(str, rbA.Text)
listviewupdate(thisDict)
End Sub