Pass code through URL Routing in ASP.Net

hi

I have 1 textbox 1 button in my page and user's table in database in this table is BEHCODE column that when users enter their behcode in TB they go to their page  i use query string for it on button click event

protected void ImageButton3_Click(object sender, ImageClickEventArgs e)
    {

        string data = Server.UrlEncode(txtNumeric.Text);

        SqlCommand _cmd = new SqlCommand("traidname", _cn);
        _cmd.CommandType = CommandType.StoredProcedure;

        _cmd.Parameters.Add("@BehCode", data);

        _cn.Open();
        string tName = _cmd.ExecuteScalar().ToString();

        _cn.Close();
        Response.Redirect(tName +"?BehCode=" + Server.UrlEncode(txtNumeric.Text));

    }

when i use querystring when users click on button and go to their page they see in address bar this address

behtob.com/store?BehCode=1111

and if i use session when they click on button and go to their page they see this address in address bar

behtob.com/store.aspx

Now i want when user's enter their behcode in TB and click on button when they go to their page they see this address in address bar

behtob.com/1111

1111 is user's behcode in DB is there any way to do it?

thanks alot