Updating a listbox item value

I have a listbox and each ite开发者_运维技巧m is made up of an object called Part which consists of 2 strings Part.PartNo & Part.Filename. I want to do something like this:

((Part)drawingList.Items[activeItem]).Filename = "My new value";

But I'm getting the error that it can't be assigned to because it is read only.

---

Listbox Items are strings (Winforms) so you'll have to parse the string and extract the two values. If there is a space separating them you'll have to do a...

string[] tokens = listbox.items[i].split(new char[] {' '});
Part p = new Part() {partno = Convert.ToInt32(tokens[0]), filename = "my new value"};