A simple program to compute the yearly compounded interest on a  loan using C# programming language.

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Program Listing
using System;
using System.Windows.Forms;

namespace CompoundInterestGUI
{
  public partial class MainForm : Form
  {
    public MainForm()
    {
      InitializeComponent();
    }

    private void btnReset_Click(object sender, EventArgs e)
    {
      txtAmount.Text = txtInterestRate.Text = String.Empty;
      spnYears.Value = spnYears.Minimum;
      dataGridView1.Rows.Clear();
    }

    private void btnCalc_Click(object sender, EventArgs e)
    {
      try
      {
        double interestRate = double.Parse(txtInterestRate.Text);
        double amount = double.Parse(txtAmount.Text);
        int years = (int)spnYears.Value;
        double interest;

        for (int year = 1; year <= years;year++)
        {
          interest = amount * interestRate / 100;
          amount += interest; 
          dataGridView1.Rows.Add(year, amount, interest);
          
        }
      }
      catch (Exception ex)
      {
        MessageBox.Show(ex.ToString());
      }
    }

    private void MainForm_Load(object sender, EventArgs e)
    {
      txtAmount.Focus();
    }
  }
}

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