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Questionpulling across value from list to display in view Pin
xnaLearner14-Dec-12 6:58
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AnswerRe: pulling across value from list to display in view Pin
xnaLearner14-Dec-12 7:49
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AnswerRe: pulling across value from list to display in view Pin
frazzle-me14-Dec-12 18:41
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GeneralRe: pulling across value from list to display in view Pin
xnaLearner15-Dec-12 9:28
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Questionproblem with relationships Pin
xnaLearner13-Dec-12 3:45
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AnswerRe: problem with relationships Pin
Richard Deeming13-Dec-12 4:48
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GeneralRe: problem with relationships Pin
xnaLearner13-Dec-12 5:37
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Question[VB.NET 2008] DataSet and XML files Pin
steve_949661313-Dec-12 1:06
membersteve_949661313-Dec-12 1:06 
Hi,
in my application (running in Windows CE) I use a XML file to store some configuration data that, at runtime, I load in a DataSet.
To read and to store these data I use the following code:
 Private Shared Function SetCfgData() As Boolean

    Try
      Dim fs As New FileStream(CGlobali.CfgDataFileComplName, FileMode.Open)
      Dim xr As XmlReader = System.Xml.XmlReader.Create(fs)

      'CGlobali.CfgData is a DataSet
      CGlobali.CfgData.Clear()
      CGlobali.CfgData.ReadXml(xr)

      xr.Close()
      fs.Close()

    Catch ex As System.IO.FileNotFoundException
      MessageBox.Show("File " & CGlobali.CfgDataFileComplName & " not found.")
      Return False
    Catch ex As XmlException
      MessageBox.Show("XmlException occured: " & ex.ToString)
      Return False
    End Try

    Return True

When the user modifies these data, they are automatically updated in the DataSet and saved in the file, at least that's what I would do...

To save the data from the DataSet to the file I do this:
  Private Shared Function UpdateCgfFile() As Boolean

    Try
      Dim StreamEncoding As Encoding
      StreamEncoding = Encoding.Unicode
      Dim cfgfile As New System.IO.StreamWriter(CGlobali.CfgDataFileComplName, True, StreamEncoding)

      CGlobali.CfgData.WriteXml(cfgfile)

      cfgfile.Close()

      Return True
    Catch ex As Exception
      Return False
    End Try
  End Function

What I would get with the above code is to update existing fields in the xml file with the new values, but what I get is that the same fields are added to the existing ones.

This is the "original" file:
<?xml version="1.0" encoding="UTF-16"?>
<Sezioni>
  <PLC>
    <IP>10.0.0.85</IP>
    <Port>502</Port>
    <Description></Description>
    <PauComm>15000</PauComm>
    <ConTOut>5000</ConTOut>
    <RxTOut>5000</RxTOut>
  </PLC>
</Sezioni>


and this is the file after a save:
<?xml version="1.0" encoding="UTF-16"?>
<Sezioni>
  <PLC>
    <IP>10.0.0.85</IP>
    <Port>502</Port>
    <Description></Description>
    <PauComm>15000</PauComm>
    <ConTOut>5000</ConTOut>
    <RxTOut>5000</RxTOut>
  </PLC>
</Sezioni>
<Sezioni>
  <PLC>
    <IP>192.168.1.10</IP>
    <Port>502</Port>
    <Description />
    <PauComm>15000</PauComm>
    <ConTOut>5000</ConTOut>
    <RxTOut>5000</RxTOut>
  </PLC>
</Sezioni>

Obviously this is not the result I want to achieve, I do not want to duplicate fields, I want to update the existing ones.

Can someone tell me what I'm doing wrong?

Thanks in advance.
AnswerRe: [VB.NET 2008] DataSet and XML files Pin
Eddy Vluggen13-Dec-12 5:28
memberEddy Vluggen13-Dec-12 5:28 
GeneralRe: [VB.NET 2008] DataSet and XML files Pin
steve_949661313-Dec-12 22:21
membersteve_949661313-Dec-12 22:21 
GeneralRe: [VB.NET 2008] DataSet and XML files Pin
Eddy Vluggen14-Dec-12 1:34
memberEddy Vluggen14-Dec-12 1:34 
QuestionAssembly with different .NET framework versions Pin
marca29212-Dec-12 11:05
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AnswerRe: Assembly with different .NET framework versions Pin
Gerry Schmitz12-Dec-12 13:25
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QuestionUse A Cookie To Send PersonID To Different Page Pin
xnaLearner12-Dec-12 5:33
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Questiondont allow user to select existing date Pin
xnaLearner10-Dec-12 6:46
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AnswerRe: dont allow user to select existing date Pin
Pete O'Hanlon10-Dec-12 6:53
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GeneralRe: dont allow user to select existing date Pin
xnaLearner10-Dec-12 7:23
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GeneralRe: dont allow user to select existing date Pin
xnaLearner11-Dec-12 0:26
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GeneralRe: dont allow user to select existing date Pin
Pete O'Hanlon11-Dec-12 0:32
protectorPete O'Hanlon11-Dec-12 0:32 
GeneralRe: dont allow user to select existing date Pin
xnaLearner11-Dec-12 0:46
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GeneralRe: dont allow user to select existing date Pin
Pete O'Hanlon11-Dec-12 0:51
protectorPete O'Hanlon11-Dec-12 0:51 
GeneralRe: dont allow user to select existing date Pin
xnaLearner11-Dec-12 1:21
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GeneralRe: dont allow user to select existing date Pin
Pete O'Hanlon11-Dec-12 2:02
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QuestionRun through loop for week and dont select weekends Pin
xnaLearner10-Dec-12 5:13
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AnswerRe: Run through loop for week and dont select weekends Pin
Pete O'Hanlon10-Dec-12 5:31
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