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Modify record in xml from code behind on page load and unload events

Posted on 2009-04-06
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Last Modified: 2013-12-17
When my web page opens, I want it to modify a value in an xml file based on what's in its Page.Title, and when the page unloads, modify that value to "Not Broadcasting". I'm having a real hard time figuring this one out--I am going about this all wrong!  Is there an Expert here that can help?
--------###CODE BEHIND###--------
Dim hashTableData As New Hashtable
Dim strWebcastName As String
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If Not Page.IsPostBack Then
            'Reading xml file
            Dim doc As System.Xml.XmlDocument = New System.Xml.XmlDocument()
            doc.Load(Server.MapPath("~/App_Data/WebcastDemos.xml"))
            Dim list As System.Xml.XmlNodeList = doc.SelectNodes("Records/Record")
            For Each node As System.Xml.XmlNode In list
                hashTableData(node.Item("ID").FirstChild.Value) = node.Item("Data").FirstChild.Value
            Next
            ViewState("Records") = hashTableData
        End If
 
        ' we do this to avoid multiple cast
        Dim myTable As Hashtable = CType(ViewState("Records"), Hashtable)
    End Sub
 
    Protected Sub Page_LoadComplete(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.LoadComplete
        strWebcastName = Page.Title
        Me.ModifyRecord()
    End Sub
 
    Protected Sub Page_Unload(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Unload
        strWebcastName = "Not Broadcasting"
        Me.ModifyRecord()
    End Sub
 
    Private Sub ModifyRecord()
        Dim key As String = ViewState("HashKey")
 
        CType(ViewState("Records"), Hashtable)(key) = strWebcastName
 
        Dim doc As System.Xml.XmlDocument = New System.Xml.XmlDocument()
        doc.Load(Server.MapPath("~/App_Data/WebcastDemos.xml"))
 
        Dim myNode As System.Xml.XmlNode = doc.SelectSingleNode("Records/Record[ID='" & key & "']")
        myNode("Data").InnerText = strWebcastName
 
        doc.Save(Server.MapPath("~/App_Data/WebcastDemos.xml"))
    End Sub

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Question by:John Account
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Anurag Agarwal earned 500 total points
ID: 24076543
Where you have set the value of ViewState("HashKey") ??
Anurag

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by:John Account
ID: 24076855
I haven't. And I think the ViewState("HashKey") is completely unnecessary in this scenario, No? I mean, all I want to do is write to and modify a certain field in a certain record of the xml file, when opening the page, and then again when closing the page. So I shouldn't even need a ViewState, right? Just need a way to modify the value directly. Can you help?
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