'Column named Quantity cannot be found.
TextBox1.Text = DataGridView1.CurrentRow.Cells("Quantity").Value.ToString
TextBox2.Text = DataGridView1.CurrentRow.Cells("Total").Value.ToString
TextBox3.Text = DataGridView1.CurrentRow.Cells("Price").Value.ToString
TextBox4.Text = DataGridView1.CurrentRow.Cells("Description").Value.ToString