C#(.NET 4): DataGridView→CSV(取り急ぎ)

gistfile1.cs

            var lines = dataGridView1.Rows.Cast<DataGridViewRow>().Select(row => {
                return string.Join(",",
                    row.Cells.Cast<DataGridViewCell>().Select(cell => {
                        return string.Format("\"{0}\"", (cell.Value ?? "").ToString().Replace("\"", "\"\""));
                    })
                );
            });

            File.WriteAllLines("out.csv", lines, Encoding.GetEncoding(932));