VB 生成xml文件 并使用xsd验证

Private Function createXML_old(ByVal xmlName As String) As Boolean
　　　　Dim SrcPath As String = "c\project\srcXmlFiles\"        '产生的xml存放的目录
        Try
            Dim writer As New System.Xml.XmlTextWriter(SrcPath & xmlName, System.Text.Encoding.UTF8)
            Dim namespaceUrl As String = "http://www.xxx.com" '验证xsd需要用到的namespaceUrl
            writer.Formatting = Formatting.Indented
            writer.WriteStartDocument()
            writer.WriteStartElement("root", "test", namespaceUrl)
            writer.WriteElementString("firstNode1", "values")
            writer.WriteElementString("firstNode2", "values")
            writer.WriteElementString("firstNode3", "values")
            writer.WriteElementString("firstNode4", "values)
            writer.WriteElementString("firstNode5", values)
            writer.WriteElementString("firstNode6Id", values)
            Dim dv As DataView = cn.getData.DefaultView()
            If dv.Count > 0 Then
                For Each item As DataRowView In dv
                    writer.WriteStartElement("firstNode7")
                    writer.WriteElementString("secondNode1", values)
                    writer.WriteElementString("secondNode2", values)
                    writer.WriteElementString("secondNode3", values)
                
                    Dim dv2 As DataView = cn.getData2(item("firstNode6Id")).DefaultView()
                    If dv2.Count > 0 Then
                        For Each itemRMDetails As DataRowView In dvRMDetails
                            writer.WriteStartElement("secondNode4")
                            writer.WriteStartElement("thridNode1")
                            writer.WriteElementString("thridNode2", values)
                            writer.WriteEndElement() '关闭secondNode4
                            writer.WriteEndElement() '关闭thridNode1
                        Next
                    Else
                        writer.WriteStartElement("secondNode4")
                        writer.WriteStartElement("thridNode1")
                        writer.WriteElementString("thridNode2", "")
                        writer.WriteEndElement() '关闭secondNode4
                        writer.WriteEndElement() '关闭thridNode1
                    End If
                    writer.WriteEndElement() '关闭firstNode7
                Next
　　　　　　　Else
                   'WriteLog Function
            End If
            writer.WriteEndElement()
            writer.WriteEndDocument() '
            writer.Close()  '将XML写入文件并关闭writer
            Return True
        Catch ex As Exception
            Return False
        End Try
    End Function