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Add XML Node using another XML file

Last Modified: 2013-12-17
I have 3 xml files which is stored in one location. I want to add all these 3 XML into one XML file with different node name. I could get the XML values as string using XMLTextWriter and StringWriter; but adding to the new xml as node with this string is causing problems. The following :

 Private Sub btnXMLtoStr_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnXMLtoStr.Click

        Dim strXML As String

        Dim oXML As New XmlDocument()
        Dim oRoot As XmlNode
        Dim oNode As XmlNode
        Dim oDB As XmlNode
        Dim oTable As XmlNode

        oRoot = oXML.CreateElement("WindcatcherSettings")
        oNode = oXML.AppendChild(oRoot)

        oDB = oXML.CreateElement("ThresholdXML")
        strXML = GetXMLString("C:\Thresholds.xml")


        oTable = oXML.CreateElement(strXML)

    End Sub

    Private Function GetXMLString(ByVal XMLPath As String) As String

        Dim xmlDoc As New XmlDocument()
        Dim sw As New StringWriter()
        Dim sVal As String

            Dim xw As New XmlTextWriter(sw)
            sVal = sw.ToString()
        Catch ex As Exception

        End Try

        GetXMLString = sVal
    End Function

Error is thrown on link         oTable = oXML.CreateElement(strXML)

After writing is it possible to retrieve all the node values as string? Say I want to search for "ThresholdXML" and get all the node values as String? Please help

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