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i was helpless plz help me with this i have datagridview and xml file if i did any modification to datagridview then the modifications has to be there in xml file i dont know how to access the nodes and desecendents.

What I have tried:

if (e.ColumnIndex == 10)
XDocument xdoc = XDocument.Load("xml.xml");

DataGridViewRow data=dataGridView1.Rows[1];
data.Cells[0].Value = dataGridView1.Rows[e.RowIndex].Cells[0].Value;
data.Cells[1].Value = dataGridView1.Rows[e.RowIndex].Cells[1].Value;
data.Cells[2].Value =dataGridView1.Rows[e.RowIndex].Cells[2].Value;
data.Cells[3].Value = dataGridView1.Rows[e.RowIndex].Cells[3].Value;
data.Cells[4].Value = dataGridView1.Rows[e.RowIndex].Cells[4].Value;
data.Cells[5].Value =dataGridView1.Rows[e.RowIndex].Cells[5].Value;
data.Cells[6].Value = dataGridView1.Rows[e.RowIndex].Cells[6].Value;
data.Cells[7].Value = dataGridView1.Rows[e.RowIndex].Cells[7].Value;
data.Cells[8].Value =dataGridView1.Rows[e.RowIndex].Cells[8].Value;
data.Cells[9].Value = dataGridView1.Rows[e.RowIndex].Cells[9].Value;

I would recommend using a BindingSource, here is an excellent article about it: A Detailed Data Binding Tutorial[^]

example (quote):
BindingSource bs = new BindingSource();                              //**

private void Form1_Load(object sender, EventArgs e)
    bs.DataSource = typeof(Airplane);                                //**
    bs.Add(new Airplane("Boeing 747", 800));
    bs.Add(new Airplane("Airbus A380", 1023));
    bs.Add(new Airplane("Cessna 162", 67));

    grid.DataSource = bs;                                            //**
    grid.AutoGenerateColumns = true; // create columns automatically //**
    txtModel.DataBindings.Add("Text", bs, "Model");                  //**
Here a class is used, but you probably want to use a List<> which is perfectly possible.
To save your class or List, you could use serialization.
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It is unclear what format the data is in so here is an example for you:

And the code to load & save...
private void Load()
    string path = @".\dataset.xml";
    DataSet ds = new DataSet();
    dataGridView1.DataSource = ds;
    dataGridView1.DataMember = "employee";

private void Save()
    string path = @".\dataset.xml";
    DataSet ds = (DataSet) dataGridView1.DataSource;
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