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Dynamic adding rows into table problem


I wrote a program with code behind in C# to add row into table
dynamically and the program worked very well in .Net Framework 1.1. When I
run this program in .Net Framework 2.0 beta version, the program is not
working as in version 1.1. So what is the problem? Microsoft declared that
the version 2.0 is fully backward support, but it is not. Is that the
problem with 2.0 version?

I find out the problem in version 2.0. After adding rows into table, I
saved the table in to Session variable Session["main_table "]. When the page
posts back, I retrieved the table from
main_table = (Table) Session["main_table "]. In version 1.1 it worked well,
but in version 2.0, I could save the table after dynamically adding rows,
but when I retrieved the table on post back, I got and empty table with no
rows in it. Please help, any resource link is appreciated. Below is the
Sorry for the long code.

<%@ Page Language="C#" Inherits="WebCo ntrolTest"%>

<title> Test </title>

<form id="test_form" runat="server">
<asp:PlaceHolde r runat="server" id="holdtable" />
<asp:Button id="add_button " text="Add Row" OnClick="Create Row"
&nbsp;<asp:Butt on id="delete_butt on" text="Delete" OnClick="Detele Row"
&nbsp;<asp:Butt on id="submit_butt on" text="Submit" OnClick="Submit _Click"
<br><asp:Labe l id="label" runat="server"/>


=============== =============== ==========
WebControlTest. cs
=============== =============== ==========
using System;
using System.Web.UI;
using System.Web.UI.W ebControls;

public class WebControlTest : System.Web.UI.P age
Table main_table;
int num_row = 0;

protected Label label;
protected PlaceHolder holdtable;
protected Button delete_button;
protected Button submit_button;
TextBox text = new TextBox();
protected override void OnInit(EventArg s e) {

main_table = (Table)Session["table"];

if(main_table == null){
main_table = new Table();
main_table.Bord erWidth = 1;
main_table.Grid Lines = (GridLines)3;
protected void Page_Load(objec t sender, System.EventArg s e)
label.Text = "";
holdtable.Contr ols.Add(main_ta ble);

if(!Page.IsPost Back){
Response.Write( "New Request<br>");
Response.Write( "Page Post Back<br>");

protected void CreateRow(objec t sender, System.EventArg s e){

num_row = (main_table.Row s).Count;

TableRow r = new TableRow();
TableCell c1 = new TableCell();
TableCell c2 = new TableCell();
TextBox t = new TextBox();

t.ID = "textID" + num_row;
t.EnableViewSta te = true;

r.ID="newRow" + num_row;
c1.ID="newC1" + num_row;
c2.ID="newC2" + num_row;

c1.Text = "New Cell - " + num_row;
c2.Controls.Add (t);

r.Cells.Add(c1) ;
r.Cells.Add(c2) ;

main_table.Rows .Add(r);
Session["table"] = main_table;
protected void DeteleRow(objec t sender, System.EventArg s e)
main_table = (Table)Session["table"];
num_row = (main_table.Row s).Count;

if(num_row > 0) {
TableRow remove = main_table.Rows[num_row - 1];
main_table.Rows .Remove(remove) ;
Session["table"] = main_table;

protected void Submit_Click(ob ject sender, System.EventArg s e){
num_row = (main_table.Row s).Count;

label.Text = "";

for(int i = 0; i < num_row; i++){
text = (TextBox)holdta ble.FindControl ("textID" + i);

if(text != null){
label.Text += "textID" + i + " = " + text.Text + "<br>";
Nov 19 '05 #1
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