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Building a Loan Payment Calculator using ASP.NET 2.0

By: Jayaram Krishnaswamy	Search For More Articles! Disclaimer Author Terms
Rating: / 12
2006-11-29

Table of Contents:

Building a Loan Payment Calculator using ASP.NET 2.0

The description of the payment calculator

The code behind the finPMT.aspx page

Use of validation controls

Source code for the finPMT.aspx page

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Building a Loan Payment Calculator using ASP.NET 2.0 - Source code for the finPMT.aspx page

(Page 5 of 5 )

<%@ Page Language="VB"  
AutoEventWireup="false" 
CodeFile="finPMT.aspx.vb" 
Inherits="finPMT" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body><h2 style="color:Navy;">Periodic Payment on a Loan</h2>
<form id="form1" runat="server">
<table style="width: 506px; height: 312px; font-weight: bold; 
color: #009999; background-color: #ccffff;" 
border="1" cellpadding="1" cellspacing="2" 
title="Periodic Payment on a Loan">
<tr>
<td style="width: 260px">
Loan related item</td>
<td style="width: 25px">
Entries / <span style="color: #ff0066">Result</span>

</td>
<td style="width: 82px">
Messages</td>
</tr>
<tr>
<td style="width: 260px">
Rate of interest per period</td>
<td style="width: 25px">
<asp:TextBox ID="txtRate" runat="server">

</asp:TextBox></td>
<td style="width: 82px">
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" 
runat="server" ControlToValidate="txtRate"
ErrorMessage="Enter a number">
</asp:RequiredFieldValidator>
<asp:RegularExpressionValidator 

ID="RegularExpressionValidator1" 
runat="server" ControlToValidate="txtRate"
ErrorMessage="Only numbers allowed" 
ValidationExpression="w">
</asp:RegularExpressionValidator></td>
</tr>
<tr>
<td style="width: 260px">
Total number of payment periods in an annuity (Loan)

</td>
<td style="width: 25px">
<asp:TextBox ID="txtNper" runat="server">

</asp:TextBox></td>
<td style="width: 82px">
<asp:RequiredFieldValidator ID=

"RequiredFieldValidator2" 
runat="server" ControlToValidate="txtNper"
ErrorMessage="Enter a number">
</asp:RequiredFieldValidator>
<asp:RangeValidator ID="RangeValidator1" runat="server" 
ControlToValidate="txtNper"
ErrorMessage="Should be between 1 and 360" 

MaximumValue="360"  
MinimumValue="1">
</asp:RangeValidator></td>
</tr>
<tr>
<td style="width: 260px">
Present Value of annuity (Loan)</td>
<td style="width: 25px">
<asp:TextBox ID="txtPV" runat="server">

</asp:TextBox></td>
<td style="width: 82px">
<asp:RequiredFieldValidator ID=

"RequiredFieldValidator3" 
runat="server" ControlToValidate="txtPV"
ErrorMessage="Enter a number" Width="100px">
</asp:RequiredFieldValidator></td>
</tr>
<tr>
<td style="width: 260px">
Future value of annuity (Loan)</td>
<td style="width: 25px">
<asp:TextBox ID="txtFV" runat="server">

</asp:TextBox></td>
<td style="width: 82px">
<asp:RequiredFieldValidator ID=

"RequiredFieldValidator4" 
runat="server" ControlToValidate="txtFV"
ErrorMessage="Enter a number">

</asp:RequiredFieldValidator></td>
</tr>
<tr>
<td style="width: 260px">
When payment due, at the beginning or end of pay 

period</td>
<td colspan="2">
<asp:RadioButton ID="rbStart" runat="server" 

Checked="True" 
GroupName="opt" Text="Start" /><br />
<br />
<asp:RadioButton ID="rbEnd" runat="server" 
GroupName="opt" Text="End" /></td>
</tr>
<tr>
<td style="width: 260px">
<asp:Label ID="Label1" runat="server" 
Text="Payment per Period" Width="161px" 
ForeColor="#C00000">
</asp:Label></td>
<td colspan="3">
<asp:TextBox ID="TextBox1" runat="server" 
Width="256px">
</asp:TextBox></td>
</tr>
</table>
<br />
<asp:Button ID="Button1" runat="server" 
Text="What is the payment per period?" /><br />
<br />
<br />
 
<br />
</form>
<span style="color:red; font-weight:bold; text-decoration:underline">
Test Values<br />
</span>
<span style="color:blue;font-weight:300">
Rate of Interest 7%<br />
Present Value of Loan: 165000<br />
Future value of Loan: 0.0<br />
Number of Payments (30 Years): 360<br />
DueDate: End<br />
<span style="color: red">
Payment=1097.75<br />
</span>
</span>
</body>
</html>

Summary

In ASP.NET 2.0 you can directly use Microsoft's Visual Basic functions, of which the Financials is a subset. Some validation controls are implemented; these are by no means complete as one cannot foresee all kinds of user inputs. The calculator must function as designed. These functions may also be implemented as a web service.

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Comments On: Building a Loan Payment Calculator using ASP.NET 2.0
   · IS the article mission the implementation of Pmt?
   · This tutorial was written to expose the properties and methods of the...
   · I meant MISSING, not mission. Sorry.
   · The PMT is a function that takes couple of arguments described in the article and...

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