Help with retreiving data from litbox

I am using the code below to retreive data from a listbox with multiple rows but receiving error:

Error: Public member 'Text' on type 'String' not found.

On line:

  If CheckForNSNFix.Contains(C1NSN.Items(x).Text) Then

Code:

 For x As Integer = 0 To C1NSN.Items.Count - 1
                If CheckForNSNFix.Contains(C1NSN.Items(x).Text) Then
                    For Each xnLink As Xml.XmlNode In xdNSN.SelectNodes("/Root/NSNTable[NSN='" & C1NSN.Items(x).Text & "']")
                        NSN_ID = xnLink.SelectSingleNode("NSN_ID").InnerText
                        ''''MsgBox("NNSN" & NSN_ID)
                        If NSN_ID <> "" Then
                            CD = NSN_ID
                            If u > 0 Then
                                num1 = num1 & "" & CD & ","
                            Else
                                num1 = CD & ","
                            End If
                            u = u + 1
                        End If
                    Next
                End If
            Next

How do I fix this error? This is Windows applictaion (VS 2010)

V.