Dynamically created textbox values are not displaying in the dynamic Texbox when i click the button

Question

I have created a TextBox dynamically, and i am getting the value of the textbox when i click the button. But the value entered in the dynamic textbox gets empty when i click the button.

Below is my ASPX Code:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="Reports.WebForm1" %>

<!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></title>
</head>
<body>
<form id="form1" runat="server">
<div>

</div>

<asp:DropDownList ID="DropDownList1" runat="server" 
    onselectedindexchanged="DropDownList1_SelectedIndexChanged" AutoPostBack = "true">
    <asp:ListItem>Text</asp:ListItem>
    <asp:ListItem>Check</asp:ListItem>
</asp:DropDownList> 

<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="GetTextBoxValue" />   
</form>
</body>
</html>

CodeBehind:

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

namespace Reports
{
public partial class WebForm1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        TextBox TB = new TextBox();
        TB.ID = "abc";
        form1.Controls.Add(TB);
        Response.Write(Request.Form["abc"]);
    }

    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        createcontrol();
    }


    protected void createcontrol()
    {
        if (DropDownList1.SelectedValue.ToLower().Trim() == "text")
        {
            TextBox TB = new TextBox();
            TB.ID = "abc";
            form1.Controls.Add(TB);
        }
    }
}
}

nunespascal · Accepted Answer · 2012-08-13 05:48:04Z

1

TextBoxes save their state by default. EnableViewState is true by default.

If you want to retain the text value, you have to add the TextBox on the Init or Load event.

answered Aug 13, 2012 at 5:48

nunespascal

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hackp0int · Accepted Answer · 2012-08-13 05:49:33Z

0

You should get you dynamically created controls, in Page_PreRender - event.

Like so: //get values

protected void Page_PreRender(object sender, EventArgs e) {
   //....
}

but you should use IsPostBack in Page_Load when you creating you element's.

this will help

answered Aug 13, 2012 at 5:49

hackp0int

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