CheckBoxList OnSelectedIndexChanged event in asp.net c#

How to use OnSelectedIndexChanged event in CheckBoxList
CheckBoxListOnSelectedIndexChanged.aspx
<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
    protected void CheckBoxList1_SelectedIndexChnaged(object sender, System.EventArgs e)
    {
        Label1.Text = "You Choose Color:<br /><i>";
        foreach (ListItem li in CheckBoxList1.Items)
        {
            if (li.Selected == true)
            {
                Label1.Text += li.Text + "<br />";
            }
        }
        Label1.Text += "</i>";
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>How to use OnSelectedIndexChanged event in CheckBoxList</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Navy">CheckBoxList: OnSelectedIndexChanged</h2>
        <asp:Label 
             ID="Label1"
             runat="server"
             Font-Bold="true"
             ForeColor="Crimson"
             Font-Size="Large"
             >
        </asp:Label>
        <br />
        <asp:Label 
             ID="Label2"
             runat="server"
             Font-Bold="true"
             ForeColor="DarkBlue"
             Text="Color List"
             >
        </asp:Label>
        <asp:CheckBoxList 
             ID="CheckBoxList1"
             runat="server"
             AutoPostBack="true"
             OnSelectedIndexChanged="CheckBoxList1_SelectedIndexChnaged"
             BackColor="DodgerBlue"
             ForeColor="FloralWhite"
             >
             <asp:ListItem>AntiqueWhite</asp:ListItem>
             <asp:ListItem>Ivory</asp:ListItem>
             <asp:ListItem>DarkViolet</asp:ListItem>
             <asp:ListItem>Lavender</asp:ListItem>
             <asp:ListItem>DeepPink</asp:ListItem>
        </asp:CheckBoxList>
    </div>
    </form>
</body>
</html>








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