ASP.NET XML Output

How can I change the "type" or "output" in my attached code to XML and view it in a Responnse.Write(xmlVar)

Dim _wXML As String
        '_wXML = "<?xml version=\""1.0\"" encoding=\""UTF-8\"" ?>"
        _wXML = "<requestEnvelope>"
        _wXML &= "<requestHeader>"
        _wXML &= "<controlData>"
        _wXML &= "<clientName>XMLBusinessPartnerChannel</clientName>"
        _wXML &= "<userID>xmlweeksonly</userID>"
        _wXML &= "<password>xmlweeksonly</password>"
        _wXML &= "</controlData>"
        _wXML &= "<processData>"
        _wXML &= "<operationName>quickSearch</operationName>"
        _wXML &= "</processData>"
        _wXML &= "</requestHeader>"
        _wXML &= "<SearchRequest>"
        _wXML &= "<startDate>" & Format(startDate.SelectedDate, "MM/dd/yyyy").ToString & "</startDate>"
        _wXML &= "<endDate>" & Format(endDate.SelectedDate, "MM/dd/yyyy").ToString & "</endDate>"
        _wXML &= "<lengthOfStay>" & Trim(lengthOfStay.Text).ToString & "</lengthOfStay>"
        _wXML &= "<minUnitSize>" & Trim(minUnitSize.SelectedValue).ToString & "</minUnitSize>"
        _wXML &= "<regionCode>" & Trim(regionCode.Text).ToString & "</regionCode>"
        _wXML &= "</SearchRequest>"
        _wXML &= "</requestEnvelope>"

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