using System;

using System.Collections.Generic;

using System;

using System.Linq;

using System.Xml;                   

using System.Xml.Linq;

using System.Collections; 

using System.Collections.Generic;

using System.Data;

using System.Data.DataSetExtensions;

using System.Data.Linq;

using System.Text;

using System.Text.RegularExpressions;

using System.Xml.Serialization; 

using System.IO;

using System.Globalization;

using System.Diagnostics;

using System.Collections.Concurrent;

​

public class Program

{

    public static void Main()

    {

        string input = @"<Data_Speed>

<Tech ID = ""UMTS"">

    <Coverage ID=""Dense_Urban"">

        <DownLoad_Speed>10</DownLoad_Speed>

        <Upload_Speed>20</Upload_Speed>

    </Coverage>

    <Coverage ID=""Urban"">

        <DownLoad_Speed>30</DownLoad_Speed>

        <Upload_Speed>40</Upload_Speed>

    </Coverage>

    <Coverage ID=""SubUrban"">

        <DownLoad_Speed>50</DownLoad_Speed>

        <Upload_Speed>60</Upload_Speed>

    </Coverage>

 </Tech>

<Tech ID = ""UMTS900"">

    <Coverage ID=""Dense_Urban"">

        <DownLoad_Speed>11</DownLoad_Speed>

        <Upload_Speed>12</Upload_Speed>

    </Coverage>

    <Coverage ID=""Urban"">

        <DownLoad_Speed>13</DownLoad_Speed>

        <Upload_Speed>14</Upload_Speed>

    </Coverage>

    <Coverage ID=""SubUrban"">

        <DownLoad_Speed>15</DownLoad_Speed>

        <Upload_Speed>16</Upload_Speed>

    </Coverage>

</Tech>

<Tech ID = ""4G800"">

    <Coverage ID=""Dense_Urban"">

        <DownLoad_Speed>30</DownLoad_Speed>

        <Upload_Speed>42</Upload_Speed>

    </Coverage>

    <Coverage ID=""Urban"">

        <DownLoad_Speed>50</DownLoad_Speed>

        <Upload_Speed>34</Upload_Speed>

    </Coverage>

    <Coverage ID=""SubUrban"">

        <DownLoad_Speed>45</DownLoad_Speed>

        <Upload_Speed>46</Upload_Speed>

    </Coverage>

    <Coverage ID=""Rural"">

        <DownLoad_Speed>47</DownLoad_Speed>

        <Upload_Speed>48</Upload_Speed>

    </Coverage>

    <Coverage ID=""Variable"">

        <DownLoad_Speed>15</DownLoad_Speed>

        <Upload_Speed>52</Upload_Speed>     

    </Coverage>

    <Coverage ID=""Outdoor"">

        <DownLoad_Speed>25</DownLoad_Speed>

        <Upload_Speed>22</Upload_Speed>

    </Coverage>

</Tech>

</Data_Speed>";

        XDocument doc = XDocument.Parse(input);

        var result = doc.Descendants("Tech")

            .Where(x=>x.Attribute("ID") != null && x.Attribute("ID").Value == "UMTS900")

            .Elements("Coverage")

            .Where(x=>x.Attribute("ID") != null && x.Attribute("ID").Value == "Dense_Urban")

            .Select(x=> new 

                            {

                                Dowload_Speed = (string)x.Element("DownLoad_Speed"),

                                Upload_Speed = (string)x.Element("Upload_Speed")

                            });

        foreach(var r in result)

        {

            Console.WriteLine("{0} - {1}",r.Dowload_Speed, r.Upload_Speed);

        }

    }

}