How to use PlaceHolder in asp.net

asp.net PlaceHolder example: how to use
PlaceHolder.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 Button1_Click(object sender, EventArgs e)
    {
        Image img = new Image();
        img.ImageUrl = @"~/Images/sea.jpg";
        img.BorderWidth = 3;
        img.BorderColor = System.Drawing.Color.SaddleBrown;
        PlaceHolder1.Controls.Add(img);
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>asp.net PlaceHolder example: how to use</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Navy">PlaceHolder Example</h2>
        <asp:PlaceHolder 
            ID="PlaceHolder1"
            runat="server"
            >
        </asp:PlaceHolder>
        <br />
        <asp:Button 
             ID="Button1" 
             runat="server" 
             Text="Add Image Control" 
             OnClick="Button1_Click" 
             Font-Bold="true"
             ForeColor="SaddleBrown"
             />
    </div>
    </form>
</body>
</html>






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