private void btnAdd_Click(object sender, EventArgs e)
        {
            try
            {
                if (txtName.Text.Length > 0)
                {
                    Ref myref = new Ref();
                    myref.refName = txtName.Text;
                    myref.refSize = Convert.ToInt32(txtSize.Text);

                    refDB myrefs = new refDB();
                    myrefs.Insert(myref);
                    DataLoad();
                    myrefs.Dispose();
                }
                else
                {
                    MessageBox.Show("냉장고명을 입력하세요");
                    return;
                }

                MessageBox.Show($"{txtName.Text}이 추가되었습니다");
            }
            catch (Exception err)
            {
                MessageBox.Show(err.Message);
            }
        }