[DotNetDevelopment] CheckBoxList return selected value

[littleccguy]

Novice
VS 2008
Windows XP SP3

Creating an ASP.Net form for potential customers to complete and
email.
Have a checkboxlist component with two items: Interior [item1] and
Exterior [item2].
I am using the following method to try to return the selected value
(s).  If i select just Interior or Exterior it works fine.  If I
select both, I get Interior Interior.

it's probably something simple, but i could use some help - thanks

private string GetInteriorExterior()
        {
            string myString = "";
            for (int i = 0; i < chklstIntExter.Items.Count; i++)
            {
                if (chklstIntExter.Items[i].Selected)
                {
                    myString += chklstIntExter.SelectedValue.ToString
() + " ";
                }
            }

            return myString;
        }