Data Controls :: Condition Based Data Bind In GridView From XML

From my code I got all of my data from my xml database .. but I need to display only the data with match of my date. For example if i I give date as 7/25/2013 the data within the date oly want to display in grid view my c# code is

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;

[Code] ....

My xml database is 

<?xml version="1.0" encoding="utf-8"?>
<registration>
<Date> </Date>
<Name> </Name>
<Qualification>
</Qualification>
<areaofinterest>
</areaofinterest>

[Code] ..... 

My design view code is 

<%@ Page Language="C#" MasterPageFile="~/phoenix.master" AutoEventWireup="true" CodeFile="grid1.aspx.cs" Inherits="grid1" Title="Untitled Page" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content> <asp:Content ID="Content2" runat="server"
contentplaceholderid="ContentPlaceHolder4">

[Code] ....