Data Binding ASP.Net Tutorial

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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs"  Inherits="RepeatedValueBinding" %>



    Untitled Page


    
    

    
        
          
                          NAME="Select1" />
          
          
            
          
          
            
          
          
            
          
          
            
          
          
            
          
        
      
      
      

      
    

    


File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class RepeatedValueBinding : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    if (!Page.IsPostBack)
    {
      Hashtable ht = new Hashtable(3);
      ht.Add("value1", "Key1");
      ht.Add("value2", "Key2");
      ht.Add("value3", "Key3");
      Select1.DataSource = ht;
      Select2.DataSource = ht;
      Listbox1.DataSource = ht;
      DropdownList1.DataSource = ht;
      CheckList1.DataSource = ht;
      OptionList1.DataSource = ht;
      Page.DataBind();
    }
  protected void cmdGetSelection_Click(object sender, EventArgs e)
  {
    if (Select1.SelectedIndex != -1)
      Result.Text += "- Item selected in Select1: " + Select1.Items[Select1.SelectedIndex].Text + " - " + Select1.Value + "
";
    
    if (Select2.SelectedIndex != -1)
      Result.Text += "- Item selected in Select2: " + Select2.Items[Select2.SelectedIndex].Text + " - " + Select2.Value + "
";
    if (Listbox1.SelectedIndex != -1)
      Result.Text += "- Item selected in Listbox1: " + Listbox1.SelectedItem.Text + " - " + Listbox1.SelectedItem.Value + "
";
    if (DropdownList1.SelectedIndex != -1)
      Result.Text += "- Item selected in DropdownList1: " + DropdownList1.SelectedItem.Text + " - " + DropdownList1.SelectedItem.Value + "
";
    if (OptionList1.SelectedIndex != -1)
      Result.Text += "- Item selected in OptionList1: " + OptionList1.SelectedItem.Text + " - " + OptionList1.SelectedItem.Value + "
";
    if (CheckList1.SelectedIndex != -1)
    {
      Result.Text += "- Items selected in CheckList1: ";
      foreach (ListItem li in CheckList1.Items)
      {
        if (li.Selected)
          Result.Text += li.Text + " - " + li.Value + " ";
      }
    }
  }
}