Too many Textboxes

**Philosophaie** · Jan 23, 2013 12:25

How do you configure if you have too many textboxes.

I have set up in Default.aspx.vb:

Code:

Imports Microsoft.VisualBasic
Imports System.Diagnostics
Public Class _Default
    Inherits System.Web.UI.Page
    Dim WithEvents Button1 As New Button
    Dim textbox1, textbox2, textbox3, textbox4 As New TextBox
    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim pi, mo, dy, yr, lon, lat As Double
        mo = CDbl(textbox1.Text)
        dy = CDbl(textbox2.Text)
        yr = CDbl(textbox3.Text)
        JD=367*yr-int(7/4*(yr+int((mo+9)/12))) +dy+1721013.5
        textbox4.text=JD
     end sub

end class

Where am I going wrong?

**Serenarules** · Jan 24, 2013 04:27

Using old-style control arrays no longer works. But there's a way to get around it! Instead of drag-dropping the controls onto your form, add a control array to your underlying class, create your controls dynamically, add it to your custom array, then write it out to the form. Here's a better explanation (though long). This article also explains how to hook up your event handlers and so on. Good luck.

http://msdn.microsoft.com/en-us/libr...(v=vs.71).aspx

**Serenarules** · Jan 24, 2013 05:30

Here is a simple example (you'll have to convert to VB as I don't do VB):

Code ASP:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication1.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">
    <p><asp:Literal ID="Output" runat="server" /></p>
    </form>
</body>
</html>

Code Csharp:

using System;
using System.Collections.Generic;
using System.Web.UI;
using System.Web.UI.WebControls;
 
namespace WebApplication1
{
 
    public partial class WebForm1 : Page
    {
 
        private IList<TextBox> _textBoxes = new List<TextBox>();
 
        protected void Page_Init(object sender, EventArgs e)
        {
 
            Output.Text = "Waiting for input...";
 
            for (int index = 0; index < 10; index++)
            {
 
                Literal beginPara = new Literal();
                beginPara.Text = "<p>";
                form1.Controls.Add(beginPara);
 
                TextBox textBox = new TextBox();
 
                // setting ID, the event handler and autopostback is important here!
                textBox.ID = String.Format("TextBox{0}", index.ToString());
                textBox.TextChanged += new EventHandler(TextBox_TextChanged);
                textBox.AutoPostBack = true;
 
                _textBoxes.Add(textBox);
                form1.Controls.Add(textBox);
 
                Literal endPara = new Literal();
                endPara.Text = "</p>";
                form1.Controls.Add(endPara);
 
            }
 
        }
 
        protected void TextBox_TextChanged(object sender, EventArgs e)
        {
 
            Output.Text = (sender as TextBox).Text;
 
        }
 
    }
 
}

There is probably a much easier way using the asp:repeater control, but I've been away from WebForms for far too long to provide that answer.

In your case, forego attaching a custom handler to the boxes themselves. Attach it to a single button. Then use the IList variable to access the controls. It saves having to use FindContol later.

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