checked list box issue

[tendaimare]

i have a checked list box and a text box i am using the code below to enter the item that is checked in to the textbox and it is working fine.How ever the problem comes when a user checks an item and then uncheks it the code is belowliz help

If txtSQL.Text = "" Then
            txtSQL.Text = chlTableCols.GetItemText(chlTableCols.SelectedItem.ToString)
        Else
            txtSQL.Text = txtSQL.Text.ToString + ("," + chlTableCols.GetItemText(chlTableCols.SelectedItem))
        End If

[Hack]

How ever the problem comes when a user checks an item and then uncheks it

What problem comes?

[vb_ftw]

in the checkbox checkchanged event u can add a code for the checkbox that is on the event of checkchanged the textbox should be filled with the selected item from<wherever> and on uncheck it should set the textbox to ""