<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>CheckBoxTest</title>
</head>
<body>
<form id="Form1" runat="server">
<div>
<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>
</asp:CheckBoxList>
<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>
</div>
</form>
</body>
</html>
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
ListBox1.Items.Clear();
// 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
ListBox1.Items.Add(li.Text);
// 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
else
{
// 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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