vb.net and WMI - remote process killing

Attempting to kill a remote process using vb.net and wmi.  I can query the processes fine and is a specify a process ID to kill, it works fine, but when i try and set the process id as variable it fails.  Assuming it fails because im not calling the selecteditem properly:

Dim RC As String = TextBox1.Text
        Dim taskID As String = listview2.selecteditems (doesnt work), (when i replace with "4784", it works)

        Dim theScope As New ManagementScope("\\" & RC & "\root\cimv2")
        Dim objectQuery As New ObjectQuery(String.Concat("SELECT * FROM Win32_Process WHERE ProcessID='", taskID, "'"))
        For Each managementObject As ManagementObject In (New ManagementObjectSearcher(theScope, objectQuery)).[Get]()
            managementObject.InvokeMethod("Terminate", Nothing)
        Next
    End Sub

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