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Literal

Этот элемент управления превращается в текст.
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  Default.aspx  
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
 
<!DOCTYPE html>
 
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
 <meta charset="utf-8" />
 <title></title>
</head>
<body>
 <form id="form1" runat="server">
  <div>
   <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
   &nbsp;&nbsp;
   <asp:Label ID="Label1" runat="server" Text="Name" AssociatedControlID="TextBox1"></asp:Label>
   <br />
   <br />
   <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
   &nbsp;&nbsp;
   <asp:Label ID="Label2" runat="server" Text="City" AssociatedControlID="TextBox2"></asp:Label>
   <br />
   <br />
   <asp:Button ID="Button1" runat="server" Text="OK" OnClick="Button1_Click" />
   &nbsp;&nbsp;
   <asp:Button ID="Button2" runat="server" Text="Clear" OnClick="Button2_Click" />
   <br />
   <br />
   <asp:Literal ID="Literal1" runat="server"></asp:Literal>
  </div>
 </form>
</body>
</html>
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  Default.aspx.cs  
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
 
public partial class _Default : System.Web.UI.Page {
 protected void Page_Load(object sender, EventArgs e) {
 
 }
 protected void Button1_Click(object sender, EventArgs e) {
  Literal1.Text = "Hello " + TextBox1.Text + " from " + TextBox2.Text;
 }
 protected void Button2_Click(object sender, EventArgs e) {
  TextBox1.Text = string.Empty;
  TextBox2.Text = string.Empty;
  Literal1.Text = string.Empty;
 }
}