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EventHandler

<%@ Page Language="C#" CodeFile="Default.aspx.cs"  Inherits="Default_aspx" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server">     <title>ASP.NET Server Controls</title> </head> <body>     <form id="form1" runat="server">     <div>       <h1>ASP.NET Server Controls</h1>       <h2>The date and time is <% =DateTime.Now.ToString() %>.</h2>           <asp:TextBox ID="txtBookName" runat="server" Width="250px">Enter a book name.</asp:TextBox>           <asp:Button ID="btnBookName" runat="server" Text="Book Name" OnClick="btnBookName_Click" />           <asp:Label ID="lblBookName" runat="server"></asp:Label>     </div>     </form> </body> </html> File: Default.aspx.cs using System; using System.Data; using System.Configuration; 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 Default_aspx : System.Web.UI.Page  {     public Default_aspx()     {         Load += new EventHandler(Page_Load);     }     protected void btnBookName_Click(object sender, EventArgs e)     {        lblBookName.Text = txtBookName.Text;     }  }