How can I properly get my 'Calculate' button to calculate the total and discount?

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 using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;
 
namespace XEx02Quotation

{

    public partial class Default : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {
 
        }
 
        protected void Button1_Click(object sender, EventArgs e)

        {

            if (IsValid)

            {

                int SalesPrice = Convert.ToInt32(TextBox1.Text);

                double DiscountPercentage= Convert.ToDouble(TextBox2.Text);

                double discountAmount = Convert.ToDouble(Label1.Text);

                double TotalPrice = Convert.ToDouble(Label2.Text);

                double discountValue = this.CalculateDiscountValue(SalesPrice, DiscountPercentage, discountAmount);

                double TotalValue = this.TotalPriceCalculate(TotalPrice, SalesPrice, discountAmount);

                Label1.Text = discountValue.ToString("c");

                Label2.Text = TotalPrice.ToString("c"); 
 
            }

        }

        protected double CalculateDiscountValue(int SalesPrice, double DiscountPercentage, double discountAmount)

        {

            discountAmount = SalesPrice * DiscountPercentage;

            return discountAmount; 

        }
 
        protected double TotalPriceCalculate(double TotalPrice, int SalesPrice, double discountAmount)

        {

            TotalPrice = SalesPrice - discountAmount;

            return TotalPrice; 

        }
 
    }
 
}

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 <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="XEx02Quotation.Default" %>
 
<!DOCTYPE html>
 
<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

    <title>Price quotation</title>

    <style type="text/css">

        .auto-style1 {

            width: 54%;

            height: 213px;

        }

        .auto-style15 {

            width: 114px;

            height: 23px;

        }

        .auto-style16 {

            width: 114px;

        }

        .auto-style17 {

            width: 114px;

            height: 28px;

        }

        .auto-style18 {

            width: 193px;

            height: 23px;

        }

        .auto-style20 {

            width: 193px;

            height: 28px;

        }

        .auto-style21 {

            width: 193px;

        }

        .auto-style22 {

            margin-left: 12px;

        }

        .auto-style23 {

            margin-left: 16px;

        }

        .auto-style25 {

            width: 193px;

            height: 5px;

        }

        .auto-style26 {

            width: 114px;

            height: 5px;

        }

        .auto-style27 {

            width: 143px;

            height: 23px;

        }

        .auto-style28 {

            width: 143px;

            height: 5px;

        }

        .auto-style29 {

            width: 143px;

        }

        .auto-style30 {

            width: 143px;

            height: 28px;

        }

        .auto-style31 {

            width: 143px;

            height: 25px;

        }

        .auto-style32 {

            width: 193px;

            height: 25px;

        }

        .auto-style33 {

            width: 114px;

            height: 25px;

        }

    </style>

</head>

<body>
 
    <form id="form1" runat="server">
 
        <h1>Price quotation</h1>
 
        <br />

        <br />

        <table class="auto-style1">

            <tr>

                <td class="auto-style27">Sales Price</td>

                <td class="auto-style18">

                    <asp:TextBox ID="TextBox1" runat="server" CssClass="auto-style23" Width="173px" Font-Bold="True"></asp:TextBox>

                </td>

                <td class="auto-style15"></td>

            </tr>

            <tr>

                <td class="auto-style27"></td>

                <td class="auto-style18"></td>

                <td class="auto-style15"></td>

            </tr>

            <tr>

                <td class="auto-style27">Discount percent</td>

                <td class="auto-style18">

                    <asp:TextBox ID="TextBox2" runat="server" CssClass="auto-style22" Width="169px"></asp:TextBox>

                </td>

                <td class="auto-style15"></td>

            </tr>

            <tr>

                <td class="auto-style28">Discount amount</td>

                <td class="auto-style25">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;<asp:Label ID="Label1" runat="server" Font-Bold="True" Text="Label"></asp:Label>

                </td>

                <td class="auto-style26"></td>

            </tr>

            <tr>

                <td class="auto-style27"></td>

                <td class="auto-style18"></td>

                <td class="auto-style15"></td>

            </tr>

            <tr>

                <td class="auto-style30">Total price</td>

                <td class="auto-style20">

                    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

                    <asp:Label ID="Label2" runat="server" Font-Bold="True" Text="Label"></asp:Label>

                </td>

                <td class="auto-style17"></td>

            </tr>

            <tr>

                <td class="auto-style31">

                    </td>

                <td class="auto-style32"></td>

                <td class="auto-style33"></td>

            </tr>

            <tr>

                <td class="auto-style29">

                    <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Calculate" Width="90px" />

                </td>

                <td class="auto-style21">&nbsp;</td>

                <td class="auto-style16">&nbsp;</td>

            </tr>

        </table>
 
    </form>
 
</body>

</html>

Hello Everyone,
I have created an ASP.NET 4.6 Web Form in a web application and I using C# to implement the functionality of some of the web server controls, but I am having trouble understanding why when I hit the 'Calculate' button, it doesn't calculate the discount amount and total price in the respective labels in bold when I enter sales price and discount percentage in the textboxes. Here is my Default.aspx code and Default.aspx.cs (C#) code. What I am doing wrong?

Sep 3 '17 #1

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How can I properly get my 'Calculate' button to calculate the total and discount?

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