private void addBox() { Box box = new Box(); box.Name = textBox1.Text; box.Width = Convert.ToDouble(textBox2.Text); box.Height = Convert.ToDouble(textBox3.Text); box.Length = Convert.ToDouble(textBox4.Text); box.Max_weight = Convert.ToDouble(textBox5.Text); box.Quantity = Convert.ToInt32(textBox6.Text); box.Status = textBox7.Text; InsertSQL addHnd = new InsertSQL(); int addrecord = addHnd.addNewBox(box); MessageBox.Show("Success!!"); this.Close(); }