How do I update an entry

See more:

C#

XML

WPF

<Hints>
  <Hint>
    <ID value="1" />
    <Clues value="xxxx" />
    <Answer value="xxxx" />
    <Difficulty value="4" />
    <Date value="09/14/21" />
  </Hint>
</Hints>

What I have tried:

It is a WPF C# app and I have multiples window. One of them is Update which open a new window and displays textbox of ID(Int)and String for the rest Answer, Difficulty and Date. How do select an item from ListView and populate the textbox with the items and update the list values E.g Clues, Answer, Difficulty or date based on ID selection?

Thank you