myrowindex = dataGridView1.SelectedCells[0].RowIndex;
            mycolumnindex = dataGridView1.SelectedCells[0].ColumnIndex;
            using (BinaryWriter writer = new BinaryWriter(File.Open(FileName, FileMode.Create)))
            {
                writer.Write(dataGridView1.Columns.Count);
                writer.Write(dataGridView1.Rows.Count);
                foreach (DataGridViewRow tables in dataGridView1.Rows)
                {
                    //for (int j = 0; j < dataGridView1.Columns.Count; ++j)
                    //{
                    object parametr = tables.Cells[myrowindex].Value;
                    if (parametr == null)
                    {
                        writer.Write(false);
                        writer.Write(false);
                    }
                    else
                    {
                        writer.Write(true);
                        writer.Write(parametr.ToString());
                    }
                    //}
                }
            }