在 ASP.net 中管理用户会话

我是 ASP.net 新手，这是我的第一个WebApp。我在应用程序中遇到有关会话的问题，当我注销并按浏览器背面按钮时，它会再次将我推入应用程序。我正在使用如下代码：

    protected void Page_Load(object sender, EventArgs e)
            {
                if (Session["LiveUser"] != null)
                {
                }
                else
                {
                    Response.Redirect("InvalidForm.aspx");
                }
            }

protected void ButtonLogOut_Click(object sender, EventArgs e)
        {
            Response.Redirect("LoginForm.aspx");
            Session["LiveUser"] = null;
        }

按钮注销 ：

<asp:Button ID="ButtonLogOut" runat="server" CssClass="btnLogout"
                    Text="Log Out" OnClick="ButtonLogOut_Click" /> 

登录按钮代码隐藏：

protected void btnSubmit_Click(object sender, EventArgs e)
        {
            string query = "select UserActive from nWorksUser where Username='" + this.txtUsername.Text + "' and _password='" + Encrypt(this.txtPassword.Text) + "';";
            MySqlCommand cmd = new MySqlCommand(query, conn);
            MySqlDataReader rdr;
            conn.Open();
            rdr = cmd.ExecuteReader();
            string ActiveUser = "";
            while (rdr.Read())
            {
                ActiveUser = rdr.GetString("UserActive");
            }
            conn.Close();
            if (ActiveUser == "true")
            {
                if (trylogin(txtUsername.Text, txtPassword.Text) == true)
                {
                    Session.Add("LiveUser",GetUsername());
                    Response.Redirect("AttendanceForm.aspx");
                }
                else
                {
                    lableMessage.Text = "Wrong Credentials. Please try again";
                }
            }
            else
            {
                conn.Open();
                query = "select UserActive from nWorksUser where Username='" + this.txtUsername.Text + "';";
                MySqlCommand cmd1 = new MySqlCommand(query, conn);
                MySqlDataReader rdr1;
                rdr1 = cmd1.ExecuteReader();
                ActiveUser = "";
                while (rdr1.Read())
                {
                    ActiveUser = rdr1.GetString("UserActive");
                }
                conn.Close();
                if (ActiveUser == "true")
                {
                    lableMessage.Text = "Wrong Credentials. Please try again";
                }
                else if (ActiveUser == "")
                {
                    lableMessage.Text = "User  is anavailable..!!";
                }
                else
                {
                    lableMessage.Text = "User  is expired..!!";
                }
            }

如果您在注销后单击浏览器的后退按钮，预期的行为是要求用户名/密码不要在应用程序中再次推送。解决方案应该是什么？

protected void ButtonLogOut_Click(object sender, EventArgs e)
{
    Session.Clear();
    Session.Abandon();
    Response.Redirect("LoginForm.aspx");
}