how to sum 3 textbox values in 4th textbox

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i have to sum txt1+txt2+txt3 int txt4.
user may or may not enter values in all the three text boxes.
i have taken below code from code project solved answer,but this is not working.
please help.
.cs code

C#

protected void txtlog_TextChanged(object sender, EventArgs e)
    {
        if ((!string.IsNullOrEmpty(txtlog.Text)) && (!string.IsNullOrEmpty(txtPole.Text)) && (!string.IsNullOrEmpty(txtDangri.Text)))
        {
            txtTotalQty.Text = (Convert.ToInt32(txtlog.Text) + Convert.ToInt32(txtPole.Text) + Convert.ToInt32(txtDangri.Text)).ToString();
        }
    }
    protected void txtPole_TextChanged(object sender, EventArgs e)
    {
        if ((!string.IsNullOrEmpty(txtlog.Text)) && (!string.IsNullOrEmpty(txtPole.Text))&& (!string.IsNullOrEmpty(txtDangri.Text)))
        {
            txtTotalQty.Text = (Convert.ToInt32(txtlog.Text) + Convert.ToInt32(txtPole.Text) + Convert.ToInt32(txtDangri.Text)).ToString();
        }
    }
    protected void txtDangri_TextChanged(object sender, EventArgs e)
    {
        if ((!string.IsNullOrEmpty(txtlog.Text)) && (!string.IsNullOrEmpty(txtPole.Text)) && (!string.IsNullOrEmpty(txtDangri.Text)))
        {
            txtTotalQty.Text = (Convert.ToInt32(txtlog.Text) + Convert.ToInt32(txtPole.Text) + Convert.ToInt32(txtDangri.Text)).ToString();
        }
    }

.aspx code:

ASP.NET

<asp:TextBox ID="txtlog" runat="server" Width="150px" 
                                                ontextchanged="txtlog_TextChanged">10
 <asp:RequiredFieldValidator ID="rvlog" runat="server"                    ControlToValidate="txtlog" Display="Dynamic"  SetFocusOnError="True">*

<asp:TextBox ID="txtPole" runat="server" Width="150px" 
 ontextchanged="txtPole_TextChanged">
  <asp:RequiredFieldValidator ID="rvPole" runat="server" 
   ControlToValidate="txtPole" Display="Dynamic" 
    SetFocusOnError="True">*


  <asp:TextBox ID="txtDangri" runat="server" Width="150px" 
  ontextchanged="txtDangri_TextChanged">
   <asp:RequiredFieldValidator ID="rvDangri" runat="server" 
    ControlToValidate="txtDangri" Display="Dynamic" 
    SetFocusOnError="True">*

<asp:TextBox ID="txtTotalQty" runat="server" Width="150px">
 <asp:RequiredFieldValidator ID="rvTotalQty" runat="server" 
  ControlToValidate="txtTotalQty" Display="Dynamic" 
   SetFocusOnError="True">*

Posted 13-May-14 7:22am

ruby kaur

Updated 13-May-14 7:37am

Maciej Los

v2

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2 solutions

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fatihkaratay · Answer 1 · 2014-05-13T07:51:00

You need to create a new asp file and add 4 asp text boxes to your project. Name those accordingly.
Then create a button to add sum to the 4th text box. Your assignment doesn't say button but that will be more efficient.

Asp Codes:

ASP.NET

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



<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
        <asp:textbox id="txt1" runat="server" xmlns:asp="#unknown"></asp:textbox>
        <asp:textbox id="txt2" runat="server" xmlns:asp="#unknown"></asp:textbox>
        <asp:textbox id="txt3" runat="server" xmlns:asp="#unknown"></asp:textbox>
        <br />
        <asp:button id="btnCalculate" runat="server" onclick="btnCalculate_Click" text="Calculate" xmlns:asp="#unknown" />
        </div>

        <div>

        <asp:textbox id="txt4" runat="server" ontextchanged="TextBox4_TextChanged" xmlns:asp="#unknown"></asp:textbox>
    
    </div>
    </form>
</body>
</html>

C# Codes like this:

C#

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

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

    }
    
    protected void btnCalculate_Click(object sender, EventArgs e)
    {
        double num1 = Convert.ToDouble(txt1.Text);
        double num2 = Convert.ToDouble(txt2.Text);
        double num3 = Convert.ToDouble(txt3.Text);

        double result = num1 + num2 + num3;
        txt4.Text = result.ToString();

    }
}

ZurdoDev · Answer 2 · 2014-05-13T07:51:00

Solution 2

There are a myriad of ways to do it. One easy way is to use Decimal.TryParse

C#

Decimal total, temp;

temp = 0;
Decimal.TryParse(txt1.Text, out temp);

total+=temp;

temp=0;

Decimal.TryParse(txt2.Text, out temp);
total+=temp;

...

Posted 13-May-14 7:51am

ZurdoDev