[RESOLVED] Unbuond DataGridView does not save new row in XML file

[StefanoUd70]

Hi everybody. Hope somebody can help me with this problem that is causing me some headache:
I use a DataGridView loading data from an XML file (using a DataSet). When I try to save data to XML during FormClosing event it writes all except for the current row: if it is a new row, it is not added to my file, while if I am editing an already existing row, it does not write the modified text.

This is my (stupid) XML file:

<?xml version="1.0" standalone="yes"?>
<DataSetParametri>
  <TableParametri>
    <Nome>AAAA</Nome>
    <Parametri>AAAA</Parametri>
  </TableParametri>
  <TableParametri>
    <Nome>BBBB</Nome>
    <Parametri>BBBB</Parametri>
  </TableParametri>
  <TableParametri>
    <Nome>CCCC</Nome>
    <Parametri>CCCC</Parametri>
  </TableParametri>
</DataSetParametri>

This is the code I used for loading the XML file in DataGridView1 datagrid through DataSetParametri DataSet:

    Private Sub Parametri_Load(sender As Object, e As EventArgs) Handles MyBase.Load

            DataSetParametri.ReadXml("c:\circolo\parametri.xml")
            DataGridView1.DataSource = DataSetParametri
            DataGridView1.DataMember = "TableParametri"

    End Sub

This is the code I used to save the DataGridView1 data back to XML file when I am closing the form:

    Private Sub Parametri_FormClosing(sender As Object, e As FormClosingEventArgs) Handles Me.FormClosing

            DataSetParametri = DirectCast(DataGridView1.DataSource, DataSet)
            DataSetParametri.WriteXml("c:\circolo\parametri.xml", XmlWriteMode.IgnoreSchema)

    End Sub

What's wrong in my code? Why it does not update the file with the last editing operation?
Thanks for your help.

[StefanoUd70]

Ok I am trying to introduce a BindingSource as suggested by a skilled programmer, but I obtain the same problem. Why???? How can I solve?
Anybody can help me? Thanks in advance

Private Sub Parametri_Load(sender As Object, e As EventArgs) Handles MyBase.Load

            DataSetParametri.ReadXml("c:\circolo\parametri.xml")
            BindingSource2.DataSource = DataSetParametri
            DataGridView1.DataSource = BindingSource2
            DataGridView1.DataMember = "TableParametri"

End Sub

Private Sub Parametri_FormClosing(sender As Object, e As FormClosingEventArgs) Handles Me.FormClosing

            BindingSource2.EndEdit()
            DataSetParametri = DirectCast(BindingSource2.DataSource, DataSet)
            DataSetParametri.WriteXml("c:\circolo\parametri.xml", XmlWriteMode.IgnoreSchema)

End Sub

[StefanoUd70]

Ok I found the solution: BindingSource is not essential in my case, I can use the first way I published.
The problem is solved using a Form Validate call in this way:

Private Sub Parametri_FormClosing(sender As Object, e As FormClosingEventArgs) Handles Me.FormClosing

            Me.Validate()
            DataSetParametri.WriteXml("c:\circolo\parametri.xml", XmlWriteMode.IgnoreSchema)

End Sub