How to get data from WPF datagrid

How to get all the data from DataGrid. And also how to delete a line

It is necessary after changing the line, get either the line number and the changes, or all the lines. In order to change the data from the database (a simple txt file)

datagrid markup

<DataGrid x:Name="LVVid" Grid.Row="1" AutoGenerateColumns="False" CellEditEnding="LVVid_CellEditEnding"> <DataGrid.RowStyle> <Style TargetType="DataGridRow"> <EventSetter Event="MouseDoubleClick" Handler="DataGridRow_MouseDoubleClick"/> </Style> </DataGrid.RowStyle> <DataGrid.Columns> <DataGridTextColumn Header="ФИО" Binding="{Binding FIO}"/> <DataGridTextColumn Header="Курс, направление" Binding="{Binding Kurs}"/> <DataGridTextColumn Header="Место" Binding="{Binding Mesto}"/> <DataGridTextColumn Header="Вид практики" Binding="{Binding Vid}"/> <DataGridTextColumn Header="Начало" Binding="{Binding Nachalo}"/> <DataGridTextColumn Header="Конец" Binding="{Binding Konec}"/> <DataGridTextColumn Header="Руководитель" Binding="{Binding Ruk}"/> </DataGrid.Columns> </DataGrid> 

change processing

 private void LVVid_CellEditEnding(object sender, DataGridCellEditEndingEventArgs e) { string[] str = new string[spisok.Length]; for (int i = 0; i < spisok.Length; i++) { Blank context = spisok[i]; str[i] = spisok[i].FIO + ":" + spisok[i].Kurs + ":" + spisok[i].Mesto + ":" + spisok[i].Vid + ":" + spisok[i].Nachalo + ":" + spisok[i].Konec + ":" + spisok[i].Ruk; } File.Delete("База.txt"); File.AppendAllLines("База.txt", str); }