(收藏）OnTextChanged改变事件

在aspx中输入：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

注意：AutoPostBack=true一定要设为true不然没有效果

在.aspx.cs文件中输入

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 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void tb_Changed(object sender, EventArgs e)
{
Label2.Text = tb.Text;
}
}