'Updating a listview subitem manually C#

First time poster here.

I'm working a little app that populates a list view columns with the properties of a media file. I have 4 columns with the 4th being for manually added comments via a text box. The text box will let me add comments to an empty row but it won't allow me to select a specific row to add a comment to such as one that has been populated with data. Any thoughts.

Here is my code for populating the row with a comment:

private void btn_add_Click(object sender, EventArgs e)
{          
    ListViewItem item = new ListViewItem();
    item.SubItems.Add("");
    item.SubItems.Add("");
    item.SubItems.Add(TB_Comment.Text);
    listView1.Items.Add(item);
    TB_Comment.Clear();
    TB_title.Focus();                       

}

And here is a screenshot of the issue I'm having.

https://i.stack.imgur.com/ZeMfu.png

Any suggestions would be great. Thanks

c++sharpwinformslistview


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