C# - Calculate Total Value In Dynamically Generated Textbox

Feb 24, 2010

I am using a Website application,In that website i have created dropdownlist and textboxes as dynamically... That dropdown list contains fees list... I select one type of fees in Drop downlist and enter some amount in textbox.. then i select again one type of fees in Dropdownlist and enter some amount in textbox... and finally i select a text named as Total amount in Dropdownlist it have to automatically generate the total value of the all the textboxes(beforeCreated) in the end of the textbox...

How shall i get the total value at end of the textbox..


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txtHello is the Id which I have given to the textbox when I generated it dynamically using javascript.

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I am facing some problem that i will be very happy to get a solution for. I am retreiving a value from database and showing it in a textbox that is generated dynamically at runtime using the coding in C#.

Now the value from database shows in the textbox but when i try to modify that value and then update the value in the database it gives me simply null.

Then I tried declaring the Textbox as static but it also fails.

My Code ---

1. Default.aspx

<%@ 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>Dynamic Generation of TextBox</title>
<form id="form1" runat="server">
Select Your Department -
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True"

2. Default.aspx.cs

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;
using System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page
static TextBox t1 = new TextBox();
protected void Page_Load(object sender, EventArgs e)
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)...........

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This is some bad code but hope you understand what i meant :

This is my html coed of my gridview


This is the code that manages the validation:


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