var i=0;
            foreach (DataGridViewColumn c in dataGridView1.Columns)

            {

                i += c.Width;



            }

            dataGridView1.Width = i + dataGridView1.RowHeadersWidth + 2;

            dataGridView1.Height = dataGridView1.GetRowDisplayRectangle(dataGridView1.NewRowIndex, true).Bottom + dataGridView1.GetRowDisplayRectangle(dataGridView1.NewRowIndex, false).Height;
        }