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Editorial Team
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Asked: 2026-05-30T07:41:29+00:00

Here is my issue. I have an assignment where I have to write a

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Here is my issue. I have an assignment where I have to write a simple ASPX page the lets the users input into 3 text boxes and click a calculate button which will return the result of how many items are requested. Here’s what I have. The line
is suppose to save the users input into the ID txtPlateQty and in the C# code below, which is a separate file in visual studio 2010, I want to take the users input and convert it into an int for calculations. The issue is in the C# file the “Convert.ToInt32(txtPlateQty.Text); does not recognize the variable “txtPlateQty” as if it’s out of scope. This is a assignment for a class and my professor has and identical example and his works while mine does not. If anyone could shed some light onto what is causing this issue I would be very grateful. 

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="CashRegister.aspx.cs" Inherits="ProjectX.CashRegister" %>

<!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 id="Head1" runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TextBox ID="txtPlateQty" runat="server"></asp:TextBox>
        <asp:TextBox ID="txtSomethingElse1" runat="server"></asp:TextBox>
        <asp:TextBox ID="txtSomethingElse2" runat="server"></asp:TextBox>
        <asp:Button ID="btnCalculate" runat="server" Text="Button" onclick="btnCalculate_Click" />
    </div>
    </form>
</body>
</html>

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;


public partial class CashRegister : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void btnCalculate_Click(object sender, EventArgs e)
    {
        int plateQty = Convert.ToInt32(txtPlateQty.Text);
        int somethingElse1 = Convert.ToInt32(txtSomethingElse1.Text);
        int somethingElse2 = Convert.ToInt32(txtSomethingElse2.Text);
    }
}

<?xml version="1.0"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->
<configuration>
  <system.web>
    <compilation defaultLanguage="C#" debug="true"></compilation>
  </system.web>
</configuration>
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1 Answer

  1. Editorial Team

    Your CashRegister.aspx.cs code behind should look some thing like:

    using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class CashRegister : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void btnCalculate_Click(object sender, EventArgs e)
    {
        int plateQty = Convert.ToInt32(txtPlateQty.Text);
        int somethingElse1 = Convert.ToInt32(txtSomethingElse1.Text);
        int somethingElse2 = Convert.ToInt32(txtSomethingElse2.Text);
    }
}

    Your CashRegister.aspx markup should look like:

    <%@ Page Language="C#" AutoEventWireup="true" CodeFile="CashRegister.aspx.cs" Inherits="CashRegister" %>

<!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></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TextBox ID="txtPlateQty" runat="server"></asp:TextBox>
        <asp:TextBox ID="txtSomethingElse1" runat="server"></asp:TextBox>
        <asp:TextBox ID="txtSomethingElse2" runat="server"></asp:TextBox>
        <asp:Button ID="btnCalculate" runat="server" Text="Button" OnClick="btnCalculate_Click" />
    </div>
    </form>
</body>
</html>

    Web.config

    <?xml version="1.0"?>

<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->

<configuration>

    <system.web>
        <compilation debug="false" targetFramework="4.0" />
    </system.web>

</configuration>
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