ListViewItem Subitem update problem

[JarekG]

Hello

I'm new to C# so please go easy on me ;).
Here is my problem:
I’m trying to update subitem in a ListView.

When I do this:

lvwSchedule.SelectedItems[0].SubItems[3].Text = "test";

it does work. But when I try to do this:

lvwSchedule.SelectedItems[0].SubItems["colSundayHours"].Text = "test";

I get error:
NullReferenceException was unhandled

Object reference not set to an instance of an object.

Why can't I use the name of the columns of the listview ?


Thanks in advance.

--Jarek