[C#] Do-while Loop คำนวณดอกเบี้ยเงินฝาก

โค้ด

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void buttonReturn_Click(object sender, EventArgs e)
        {
            if (textBoxBase.Text == "" || textBoxInterest.Text == "")
            {
                MessageBox.Show("กรุณากรอกช่องว่างให้ครบถ้วน", "Not found", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }
            else
            {
                double dblBase = Convert.ToDouble(textBoxBase.Text);
                double dblInterest = Convert.ToDouble(textBoxInterest.Text);
                double dblYear = (double)numericUpDownYear.Value;

                double dblReturn = 0.0;
                string strReturn = "";
                int i = 1;
                do
                {
                    dblReturn = dblBase * (dblInterest / 100);
                    strReturn += "ผลตอบแทนปีที่ " + i.ToString() + " = " + dblReturn.ToString("#,###.##") + " บาท | เงินต้น = "+ dblBase + "\r\n";
                    dblBase = dblBase + dblReturn;
                    i++;
                } while (i <= (int)numericUpDownYear.Value);
                MessageBox.Show(strReturn);
            }
        }
    }
}

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