asp.net 跳转页面 总是在新标签页打开
使用Redirect跳转页面却始终在新标签页打开，我写的其他页面用这个方法就是在当前标签页打开的，不知道为什么这个就始终在新标签页打开

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
namespace Classmates
{
    public partial class joinClass : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                BindToGridView();
                string name = string.Empty;
                if (Session["name"] == null)
                {
                    name = "登录";

                }
                else
                {
                    name = Session["name"].ToString();


                }
                if (name == "登录")
                {

                    LinkButton3.Visible = false;
                 LinkButton1.Text = name;
                    //HyperLink1.NavigateUrl = "UserLogin.aspx";
                   LinkButton2.Text = "立即注册";
                    //HyperLink2.NavigateUrl = "UserRegister.aspx";
                }
                else
                {
                    LinkButton1.Text = name;
                    LinkButton2.Text = "退出";
                    LinkButton3.Visible = true; 
 
                    LinkButton3.Text = "未找到班级？立即创建";
                   // HyperLink2.NavigateUrl = "joinClass.aspx";
                    /*Session["name"] = null;
                    HyperLink1.Text = "登录";
                    HyperLink1.NavigateUrl = "UserLogin.aspx";
                    HyperLink2.Text = "立即注册";
                    HyperLink2.NavigateUrl = "UserRegister.aspx"; */
                    ;

                }


            }

        }
        private void BindToGridView()
        {
            string connectionstring = ConfigurationManager.ConnectionStrings["conn"].ToString();
            SqlConnection conn2 = new SqlConnection(connectionstring);
            conn2.Open();
            string sqlString = "select * from class order by cno asc ";
            SqlDataAdapter sda = new SqlDataAdapter(sqlString, conn2);
            DataSet ds = new DataSet();
            sda.Fill(ds);
            GridView1.DataSource = ds;
            GridView1.DataBind();
            conn2.Close();
           
        
        
        }
        protected void LinkButton1_Click(object sender, EventArgs e)
        {
            //登录时的单击操作
            if (LinkButton1.Text == "登录")
            {
                Response.Redirect("http://localhost:9665/UserLogin.aspx");
            }
        }

        protected void LinkButton2_Click(object sender, EventArgs e) 
 
        {
            if (LinkButton2.Text == "立即注册")
            {
                Response.Redirect("http://localhost:9665/UserRegister.aspx");
            
            }
            if (LinkButton2.Text == "退出")
            {
                Session["name"] = null;
                Response.Redirect("http://localhost:9665/joinClass.aspx");
                LinkButton1.Text = "登录";
                LinkButton2.Text = "立即注册";
            }

        }

        protected void LinkButton3_Click(object sender, EventArgs e)
        {
            if (Session["name"] !=null)
            {

                Response.Redirect("http://localhost:9665/createClass.aspx");


            }
        }

        protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
        {

            Response.Redirect("http://localhost:9665/RegisterInClass.aspx");

           
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            string date = DropDownList1.SelectedValue;
            string kd = TextBox1.Text.Trim();
            string connectionstring = ConfigurationManager.ConnectionStrings["conn"].ToString();
            SqlConnection conn2 = new SqlConnection(connectionstring);
            conn2.Open();
            string sqlString = "select * from class where cdate = '" + date + "' or  cname like '%" + kd + "%' order by cno asc ";
            SqlDataAdapter sda = new SqlDataAdapter(sqlString, conn2); 
 
            DataSet ds = new DataSet();
            sda.Fill(ds);
            GridView1.DataSource = ds;
            GridView1.DataBind();
            conn2.Close();
           
        

        }

    }
}

[解决办法]
看看这个是否对你有帮助
[解决办法]
在header中设置<base target="_self"> 如果想从其他窗口打开的，在那个标签上单独设置