Thursday, January 9, 2014

ASP.NET CheckBoxList and ListBox

<html xmlns="">
<head id="Head1" runat="server">
    <form id="Form1" runat="server">
        <asp:CheckBoxList ID="CheckBoxList1" runat="server" RepeatDirection="Horizontal"
            AutoPostBack="True" OnSelectedIndexChanged="CheckBoxList1_SelectedIndexChanged">
            <asp:ListItem Text="Diploma" Value="1"></asp:ListItem>
            <asp:ListItem Text="Graduate" Value="2"></asp:ListItem>
            <asp:ListItem Text="Post Graduate" Value="3"></asp:ListItem>
            <asp:ListItem Text="Doctrate" Value="4"></asp:ListItem>
        <br />
        <asp:ListBox ID="ListBox1" runat="server" Height="78px" Width="127px"></asp:ListBox>
        <br />
        <br />
        <asp:Label ID="lblMessage" runat="server" Font-Bold="true"></asp:Label>

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;
public partial class DropDownlist_Default : System.Web.UI.Page
    protected void CheckBoxList1_SelectedIndexChanged(object sender, EventArgs e)
        // Everytime the selection changes, clear the items in the listbox
        // Loop thru each litemitem in the checkboxlist
        foreach (ListItem li in CheckBoxList1.Items)
            // If the listitem is selected
            if (li.Selected)
                // Add the listitem text to the listbox
                // Add the lisitem as an object. This ensures the listitem is 
                // selected in the listbox. For this to work, listbox, 
                // SelectionMode must be set to Multiple. The SelectionMode
                // Property can be set in the HTML source also.
                // ListBox1.SelectionMode = ListSelectionMode.Multiple
                // ListBox1.Items.Add(li);
        // If nothing is selected from the checkboxlist
        if (CheckBoxList1.SelectedIndex == -1)
            // Set the label ForeColor to Red
            lblMessage.ForeColor = System.Drawing.Color.Red;
        // If atleast one listitem is selected
            // Set the label forecolor to black
            lblMessage.ForeColor = System.Drawing.Color.Black;
        // Display the total number of items selected from the checkboxlist
        lblMessage.Text = ListBox1.Items.Count.ToString() + " item(s) selected";


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