Checkbox in Datagrid to Filter Output

My C# application binds a grid to a datatable, allows the user to edit the data directly in the grid, then a button click event writes the datatable contents to an XML file. The code below describes the very simple code contained in the click event, which works perfectly.  Now I want to provide a checkbox in each row that will allow the user to de-select any records so that they are not to be included in the XML output.  Would appreciate help to find the most efficient method of achieving this.

private void simpleButton2_Click(object sender, EventArgs e)
{
DataTable dt3 = (DataTable)gridControl1.DataSource;
dt3.TableName = "CustomerList";
if (dt3.Rows.Count <= 0)
{
MessageBox.Show("There are no records available");
return;
}
//dt3.WriteXml
dt3.WriteXml(@textBox2.Text + "\\Customer.xml");
{
MessageBox.Show("Data successfully saved to file");
return;
}
}

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