Auto Calculation in Textbox textchanged event in ASP.NET C#

Screen Shot

Coding

1. Design Coding

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

<!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>Sample Text Change Event for Auto-Calculations</title>
</head>
<body>
    <form id="form1" runat="server">
    <h2>
 Auto Calculations </h2>
<div align="center" style="background-color: #C0C0C0" >
        <asp:TextBox ID="TextBox1" AutoPostBack="true" runat="server" 
               ></asp:TextBox><br /><br />
                                                                                
        <asp:TextBox ID="TextBox2" AutoPostBack="true" runat="server" 
            ontextchanged="TextBox2_TextChanged"></asp:TextBox> Press Tab here to generate auto calculate values<br /><br />
        <asp:TextBox ID="TextBox3" Text="Addition Result" Enabled="false" 
            runat="server" Width="266px"></asp:TextBox><br /><br />
        <asp:TextBox ID="TextBox4" Width="266px" Text="Substraction Result" Enabled="false" runat="server"></asp:TextBox><br /><br />
        <asp:TextBox ID="TextBox5" Width="266px" Text="Muliplication Result" Enabled="false" runat="server"></asp:TextBox><br /><br />
        <asp:TextBox ID="TextBox6" Width="266px" Text="Division Result" Enabled="false" runat="server"></asp:TextBox><br /><br />
    </div>
</form>
</body>
</html>

2. Code Behind

using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

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

    }
    protected void TextBox2_TextChanged(object sender, EventArgs e)
    {
        if (TextBox1.Text == " ")
        {
            TextBox1.Text = "Enter Some values here";
        }
        else
        {
            double a, b, c;
            a = Convert.ToDouble(TextBox1.Text.Trim().ToString());
            b = Convert.ToDouble(TextBox2.Text.Trim().ToString());
            c = a + b;
            TextBox3.Text = "Addition = "+c.ToString();
            c = a - b;
            TextBox4.Text = "Substraction = "+c.ToString();
            c = a * b;
            TextBox5.Text = "Multiplication = " + c.ToString();
            c = a / b;
            TextBox6.Text = "Division = "+c.ToString();

        }
    }
}

Kumaran1987

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Auto Calculation in Textbox textchanged event in ASP.NET C#

Screen Shot

Coding

1. Design Coding

2. Code Behind

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