How to convert QueryString parameter value to INT in ASP.Net C# and VB.Net

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

namespace EAD_Admin2
{
    public partial class MessageMgt_ViewMsg : System.Web.UI.Page
    {
        DateTime time = System.DateTime.Now;
        NewMsg nmBLL = new NewMsg();
        protected void Page_Load(object sender, EventArgs e)
        {
            lblDateTime.Text = time.ToString();

            int msgID = int.TryParse(Request.QueryString["id"]);
                //Create a msg object
                Msg msgIndv = null;

                //Call getMsg() method
                msgIndv = nmBLL.getMsg(id);

                //Display product details on web form
                lblSender.Text = msgIndv.Sender;
                lblReceiver.Text = msgIndv.Receiver;
                lblTitle.Text = msgIndv.Title;
                tb_message.Text = msgIndv.Message;
            

            
        }

        protected void btnBack_Click(object sender, EventArgs e)
        {
            Response.Redirect("MessageMgt_Sent.aspx");
        }

        protected void btnCreateMsg_Click(object sender, EventArgs e)
        {
            Response.Redirect("MessageMgt_Create.aspx");
        }
    }
}

I have also tried Convert.ToInt32 and int.Parse