How can I properly use the Trace.Write() method inside of my for loop to print month

[dseals22]

I am struggling with trying to figure out how I can output a trace message in ASP.NET using the Trace.Write() method inside of a for loop in order for a user to see the future value after 1 month, 10 months, and 50 months? The format should be like this:
Month{i}: & Value{futureVal ue}. So, for example, the format should look like this after the first month: "Month:" {i} "Value:"{future Value}. i know that's not right but that's why I need help understanding how I can input the variables correctly into this method. I have researched my problem, but it's not specific to my individual problem. Here is the site I have researched before coming here: (http://www.c-sharpcorner.com/UploadFile/225740/how-to-write-custom-tracing-message-in-Asp-Net/)

namespace XEx05FutureValue
{
    public partial class Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
                for (int i = 50; i <= 500; i += 50)
                    ddlMonthlyInvestment.Items.Add(i.ToString());
        }
*
        protected void btnCalculate_Click(object sender, EventArgs e)
        {
            if (IsValid)
            {
                int monthlyInvestment = Convert.ToInt32(ddlMonthlyInvestment.SelectedValue);
                decimal yearlyInterestRate = Convert.ToDecimal(txtInterestRate.Text);
                int years = Convert.ToInt32(txtYears.Text);
*
                decimal futureValue = this.CalculateFutureValue(monthlyInvestment,
                    yearlyInterestRate, years);
*
                lblFutureValue.Text = futureValue.ToString("c");
            }
        }
*
        protected decimal CalculateFutureValue(int monthlyInvestment,
        decimal yearlyInterestRate, int years)
        {
            int months = years * 12;
            decimal monthlyInterestRate = yearlyInterestRate / 12 / 100;
            decimal futureValue = 0;
            for (int i = 0; i < months; i++)
            {
                futureValue = (futureValue + monthlyInvestment)
                    * (1 + monthlyInterestRate);
                if (Trace.IsEnabled)
                {
                    Trace.Write({i} {futureValue});
                }
            }
            return futureValue;
        }
*
        protected void btnClear_Click(object sender, EventArgs e)
        {
            ddlMonthlyInvestment.SelectedIndex = 0;
            txtInterestRate.Text = "";
            txtYears.Text = "";
            lblFutureValue.Text = "";
        }
    }
}