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)
    {
        Button1.Click += Button1_Click;
    }

    private void Button1_Click(object sender, EventArgs e)
    {
        //点击按钮
        string s = TextBox1.Text;//接受用户输入的内容
        Response.Redirect("Default2.aspx?aaa="+ s  );// 跳转到Default2.aspx页面并将s传给Default2.aspx
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
       Label1.Text= Request["aaa"];//用label1接受下传过来的值
    }
}