xml read and write

Below codes are tyring to get xml string from actual entire xml file. but now I want to put some conditions.
like I just want to get Application Name="A1" condition. so I suppose to get only Application Name= "A1" of course with all child nodes as well.
How can I modify it?

public static string convertToXmlString(string strFile)
        {
            //Q6: How to get xml string filter by applicationName? need help
            // Load the xml file into XmlDocument object.
            XmlDocument xmlDoc = new XmlDocument();
            try
            {
                xmlDoc.Load(strFile);                                 
            }
            catch (XmlException e)
            {
                Console.WriteLine(e.Message);
            }
            // Now create StringWriter object to get data from xml document.
            StringWriter sw = new StringWriter();
            XmlTextWriter xw = new XmlTextWriter(sw);
            xmlDoc.WriteTo(xw);
            return sw.ToString();
            
        }

Select allOpen in new window

<?xml version="1.0" encoding="utf-8" ?>
<Applications>
  <Application Name="A1" Script="">
    <Q Id="1">
      <Name>What is your favor color?</Name>
      <Control>Select</Control>
      <List>Red,Yellow</List>
      <PdfFieldName>pdfColor</PdfFieldName>
      <HtmlFieldName>selectFavorColor</HtmlFieldName>
      <DefaultHtmlValue>Red</DefaultHtmlValue>      
    </Q>
    <Q Id="2">
      <Name>What is your favor car?</Name>
      <Control>TextBox</Control>
      <List></List>
      <PdfFieldName>pdfCar</PdfFieldName>
      <HtmlFieldName>textFavorCar</HtmlFieldName>
      <DefaultHtmlValue></DefaultHtmlValue>      
    </Q>
    <Q Id="3">
      <Name>What is your favor hobby?</Name>
      <Control>Checkbox</Control>
      <List>Sport,Gamble</List>
      <PdfFieldName>asdfasdf</PdfFieldName>
      <HtmlFieldName>textFavorHobby</HtmlFieldName>
      <DefaultHtmlValue>Sport</DefaultHtmlValue>      
    </Q>
  </Application>
  <Application Name="A2" Script="customScriptA2.js">
    <Q Id="1">
      <Name>What is your favor color?</Name>
      <Control>Select</Control>
      <List>Red,Yellow</List>
      <PdfFieldName>pdfColor</PdfFieldName>
      <HtmlFieldName>selectFavorColor</HtmlFieldName>
      <DefaultHtmlValue>Red</DefaultHtmlValue>      
    </Q>
    <Q Id="2">
      <Name>What is your favor car?</Name>
      <Control>TextBox</Control>
      <List></List>
      <PdfFieldName>pdfCar</PdfFieldName>
      <HtmlFieldName>textFavorCar</HtmlFieldName>
      <DefaultHtmlValue></DefaultHtmlValue>      
    </Q>
    <Q Id="3">
      <Name>What is your favor hobby?</Name>
      <Control>CheckBox</Control>
      <List>Sport,Gamble</List>
      <PdfFieldName>asdfasdf</PdfFieldName>
      <HtmlFieldName>textFavorHobby</HtmlFieldName>
      <DefaultHtmlValue>Sport</DefaultHtmlValue>      
    </Q>
  </Application>
</Applications>

Select allOpen in new window