注册成功后将信息加到Session中
User u = new  User();
u.Name = "admin";
u.Password = "123";
Session["user"] = User

  protected void Button1_Click(object sender, EventArgs e)
    {
        string s = "";
        string str = "insert into zhuce (yonghuming,mima,dizhi,shoujihao,youxiang) values ('" + yonghuming.Text + "','" + mima.Text + "','" + dizhi.Text + "','" + zcshouji.Text + "','" + zcyouxiang.Text + "')";
        OleDbConnection con = new OleDbConnection(System.Configuration.ConfigurationManager.AppSettings["SQLConnString"].ToString());
        con.Open();
        OleDbCommand com = new OleDbCommand(str, con);
        int ss = com.ExecuteNonQuery();
        con.Close();
        if (s == "")
        {
            Response.Redirect("~/登陆.aspx");
        }
        else
        {
            Label1.Text = "注册失败";
        }
        zhuceq zhu = new zhuceq();
        zhu.Yonghuming = yonghuming.Text;
        zhu.Mima = mima.Text;
        Session["zhuceq"] =zhu ;
        这是在注册页面 的代码  protected void Button1_Click(object sender, EventArgs e)
    {
        string yonghuming = this.TextBox1.Text.Trim();
        string mima = this.TextBox2.Text.Trim();
        string str = "select yonghuming from zhuce where yonghuming='" + TextBox1.Text.Trim() + "'and mima='" + TextBox2.Text.Trim() + "'";
        OleDbConnection con = new OleDbConnection(System.Configuration.ConfigurationManager.AppSettings["SQLConnString"].ToString());
        con.Open();
        OleDbDataAdapter da = new OleDbDataAdapter(str, con);
        DataSet ds = new DataSet();
        da.Fill(ds);
        con.Close();
        if (ds.Tables[0].Rows.Count > 0)
        {
            Session["yonghuming"] = this.TextBox1.Text;
            Response.Redirect("~/首页.aspx");
            TextBox1.Text = ((zhuceq)Session["zhuceq"]).Yonghuming;
            TextBox2.Text = ((zhuceq)Session["zhuceq"]).Mima;
        }
        else
        {
            Response.Write("<script>alert('用户帐号/密码错误。')</script>");

        }
      
    }
这是登录页面的代码

注册页面的注册 应该是判断
if(ss>0){
    zhuceq zhu = new  zhuceq();
    zhu.Yonghuming = yonghuming.text;
    zhu.Mima =mima.text;
    Response.Redirect("~/登陆.aspx");
}else{
Labal1.text="注册失败";
}

问一下你的注册页和登陆页是一个页面吗？看着你登陆页面代码怪怪的呀