Dynamic Control

microsoft.public.dotnet.framework.aspnet.webcontrols

24 Jan 2006 4:35 PM

Bishoy George

Hi,
I made a page with a button , when I click that button ---> a new TextBox
object is displayed.

I made the following code but the bug is:
Every time I click the button ---> a new TextBox appear but the previous one
DISAPPEARS!!!!

Could you fix it for me, please?

//.aspx page
//-----------------------------------------------------------------
<%@ Page language="c#" Codebehind="Default.aspx.cs" AutoEventWireup="false"
Inherits="DynamicControls._Default" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>Default</title>
<meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR">
<meta content="C#" name="CODE_LANGUAGE">
<meta content="JavaScript" name="vs_defaultClientScript">
<meta content="http://schemas.microsoft.com/intellisense/ie5"
name="vs_targetSchema">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
   <asp:Button id="btnGetTexBox" style="Z-INDEX: 101; LEFT: 16px; POSITION:
absolute; TOP: 16px"
    runat="server" Text="Get TextBox!"></asp:Button></form>
</body>
</HTML>
//----------------------------------------------------------------------
// .aspx.cs page
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace DynamicControls
{
/// <summary>
/// Summary description for _Default.
/// </summary>
public class _Default : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Button btnGetTexBox;

private void Page_Load(object sender, System.EventArgs e)
{
   if(!Page.IsPostBack)
   {
    Session["turn"] = -1;
   }
}

#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
   //
   // CODEGEN: This call is required by the ASP.NET Web Form Designer.
   //
   InitializeComponent();
   base.OnInit(e);
}

/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
   this.btnGetTexBox.Click += new
System.EventHandler(this.btnGetTexBox_Click);
   this.Load += new System.EventHandler(this.Page_Load);

}
#endregion

private void btnGetTexBox_Click(object sender, System.EventArgs e)
{
   Session["turn"] = (int)Session["turn"] + 1;
   int turn = (int)Session["turn"];

   TextBox tb = new TextBox();
   tb.ID = "txtData" + Session["turn"].ToString();
   tb.TextMode = TextBoxMode.MultiLine;
//   Height="104px" Width="544px
   tb.Height = Unit.Pixel(100);
   tb.Width = Unit.Pixel(500);

//   Style = "Z-INDEX: 101; LEFT: 16px; POSITION: absolute; TOP: 16px"
   int zIndex = 102 + (int)Session["turn"];

   tb.Style.Add("Z-INDEX",zIndex.ToString());
   tb.Style.Add("LEFT","16px");
   tb.Style.Add("POSITION","absolute");

   int top = 50 + (turn * 100);

   tb.Style.Add("TOP",top.ToString() + "px");

   this.Controls[1].Controls.Add(tb);
}

}
}