ListView Sorting

Question

I want to sort the listview data when click at the column header. Found this article with the code. http://msdn.microsoft.com/en-us/library/ms229643%28v=vs.90%29.aspx

but when run it, the first line

ColHeader clickedCol = (ColHeader)this.listView_ChkInOut.Columns[e.Column];

already generate error invalid cast exception was unhandled.

public class ColHeader : ColumnHeader
        {
            public bool ascending;
            public ColHeader(string text, int width, HorizontalAlignment align, bool asc)
            {
                this.Text = text;
                this.Width = width;
                this.TextAlign = align;
                this.ascending = asc;
            }
        }

I don't understand the code, can some explain why it had that error?

Answer 1

        ColumnHeader lickedCol = (ColumnHeader)this.listView1.Columns[e.Column];
        MessageBox.Show(lickedCol.Text);

As far as i can see this should work properly. At least i get the right text.

In the example you provided this happens when he added the Columnheaders

// parameter specifies true for an ascending sort order.
listView1.Columns.Add(new ColHeader("Name", 110, HorizontalAlignment.Left, true));
listView1.Columns.Add(new ColHeader("Region", 50, HorizontalAlignment.Left, true));
listView1.Columns.Add(new ColHeader("Sales", 70, HorizontalAlignment.Left, true));

He added ColHeaders and not ColumnHeaders. I think you havent done this and then you get the error, at least this is what happend to me ;)