Implement Nested Blog Comment Box in ASP.Net C#

 my aspx code

<%@ Page Title="" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="AddComments.aspx.cs" Inherits="AddComments" EnableEventValidation="false" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
    <style type="text/css">
        body
        {
            font-family: Arial;
            font-size: 10pt;
        }
    </style>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
    <section id="content">
			<div class="content-wrap">
				<div class="container clearfix">
    <asp:Repeater ID="rptComments" runat="server">
        <ItemTemplate>
            <table>
                <tr>
                    <td>
                        <b>Name</b>
                    </td>
                    <td style="padding-left: 20px;">
                        <asp:Label ID="lblName" runat="server" Text='<%# Eval("Name") %>'></asp:Label>
                    </td>
                </tr>
                <tr>
                    <td>
                        <b>Email</b>
                    </td>
                    <td style="padding-left: 20px;">
                        <asp:Label ID="lblEmail" runat="server" Text='<%# Eval("Email") %>'></asp:Label>
                    </td>
                </tr>
                <td>
                    <b>Comment Body</b>
                </td>
                <td style="padding-left: 20px;">
                    <asp:Label ID="lblCommentBody" runat="server" Text='<%# Eval("CommentBody") %>'></asp:Label>
                </td>
            </table>
        </ItemTemplate>
    </asp:Repeater>
    <hr />
    <table>
        <tr>
            <td>
                <b>Name</b>
            </td>
            <td style="padding-left: 20px;">
                <asp:TextBox ID="txtName" runat="server" />
            </td>
            <td>
                <asp:RequiredFieldValidator ID="rfvName" runat="server" Display="Dynamic" ControlToValidate="txtName"
                    ErrorMessage="Required"></asp:RequiredFieldValidator>
            </td>
        </tr>
        <tr>
            <td>
                <b>Email</b>
            </td>
            <td style="padding-left: 20px;">
                <asp:TextBox ID="txtEmail" runat="server" />
            </td>
            <td>
                <asp:RequiredFieldValidator ID="rfvEmail" runat="server" Display="Dynamic" ControlToValidate="txtEmail"
                    ErrorMessage="Required"></asp:RequiredFieldValidator>
                <asp:RegularExpressionValidator ID="revEmail" runat="server" Display="Dynamic" ControlToValidate="txtEmail"
                    ErrorMessage="Invalid Email Id" ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"></asp:RegularExpressionValidator>
            </td>
        </tr>
        <tr>
            <td>
                <b>Comment Body</b>
            </td>
            <td style="padding-left: 20px;">
                <asp:TextBox ID="txtCommentBody" TextMode="MultiLine" Height="200" runat="server" />
            </td>
            <td>
                <asp:RequiredFieldValidator ID="rfvCommentBody" runat="server" Display="Dynamic"
                    ControlToValidate="txtCommentBody" ErrorMessage="Required"></asp:RequiredFieldValidator>
            </td>
        </tr>
        <tr>
            <td>
            </td>
            <td style="padding-left: 20px;">
                <asp:Button ID="btnAdd" runat="server" OnClick="AddComment" Text="Add Comment" />
            </td>
            <td>
            </td>
        </tr>
    </table>
    </div>
    </div>
    </section>
</asp:Content>

my aspx.cs code :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Configuration;
using System.Data;


public partial class AddComments : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
            this.PopulateComments();
        }
    }
    protected void AddComment(object sender, EventArgs e)
    {
        string constr = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        string sqlStatment = "INSERT INTO Comments(Name,Email,CommentBody) values(@Name,@Email,@CommentBody)";
        using (SqlConnection con = new SqlConnection(constr))
        {
            using (SqlCommand cmd = new SqlCommand(sqlStatment, con))
            {
                con.Open();
                cmd.Parameters.AddWithValue("@Name", this.txtName.Text.Trim());
                cmd.Parameters.AddWithValue("@Email", this.txtEmail.Text.Trim());
                cmd.Parameters.AddWithValue("@CommentBody", txtCommentBody.Text.Trim());
                cmd.ExecuteNonQuery();
                con.Close();
            }
        }
        Response.Redirect("~/AddComments.aspx");
    }
    private void PopulateComments()
    {
        string constr = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        string sqlStatment = "SELECT Name,Email,CommentBody FROM Comments";
        using (SqlConnection con = new SqlConnection(constr))
        {
            using (SqlCommand cmd = new SqlCommand(sqlStatment, con))
            {
                using (SqlDataAdapter da = new SqlDataAdapter(cmd))
                {
                    DataSet ds = new DataSet();
                    da.Fill(ds);
                    this.rptComments.DataSource = ds;
                    this.rptComments.DataBind();
                }
            }
        }
    }
}

my sql :

CREATE TABLE [dbo].[Comments] (
    [CommentId]   INT             IDENTITY (1, 1) NOT NULL,
    [CommentBody] NVARCHAR (2000) NOT NULL,
    [Name]        VARCHAR (30)    NOT NULL,
    [Email]       NVARCHAR (50)   NOT NULL,
    CONSTRAINT [PK_Comments] PRIMARY KEY CLUSTERED ([CommentId] ASC)
);

everything is normal but I want to do it like this.

I do not want no membership system. Is this a problem for security?