private void SetDefaultNames()
        {
            // set default column names if they exist in the spread sheet
            GazetteerColumnHeaders defaultColumnHeaders =
                geoCoder.DefaultGazetteerColumnHeaders();

            cboLevel1Codes.SelectedIndex =
                cboLevel1Codes.FindStringExact(defaultColumnHeaders.Level1Code);
            cboLevel2Codes.SelectedIndex =
                cboLevel2Codes.FindStringExact(defaultColumnHeaders.Level2Code);
            cboLevel3Codes.SelectedIndex =
                cboLevel3Codes.FindStringExact(defaultColumnHeaders.Level3Code);

            cboLevel1Names.SelectedIndex =
                cboLevel1Names.FindStringExact(defaultColumnHeaders.Level1Name);
            cboLevel2Names.SelectedIndex =
                cboLevel2Names.FindStringExact(defaultColumnHeaders.Level2Name);
            cboLevel3Names.SelectedIndex =
                cboLevel3Names.FindStringExact(defaultColumnHeaders.Level3Name);

            cboLevel1AltNames.SelectedIndex =
                cboLevel1AltNames.FindStringExact(defaultColumnHeaders.Level1AltName);
            cboLevel2AltNames.SelectedIndex =
                cboLevel2AltNames.FindStringExact(defaultColumnHeaders.Level2AltName);
            cboLevel3AltNames.SelectedIndex =
                cboLevel3AltNames.FindStringExact(defaultColumnHeaders.Level3AltName);
        }