C# 7 and .NET: Designing Modern Cross-platform Applications

Implementing disposal with try statement

Modify the WorkWithXml method, as shown highlighted in the following code:

static void WorkWithXml(){   FileStream xmlFileStream = null;   XmlWriter xml = null;   try   {      // define a file to write to      string xmlFile = Combine(CurrentDirectory, "streams.xml");      // create a file stream      xmlFileStream = File.Create(xmlFile);      // wrap the file stream in an XML writer helper      // and automatically indent nested elements      xml = XmlWriter.Create(xmlFileStream,       new XmlWriterSettings { Indent = true });      // write the XML declaration       xml.WriteStartDocument();      // write a root element       xml.WriteStartElement("callsigns");      // enumerate the strings writing each one to the stream       foreach (string item in callsigns)      { xml.WriteElementString("callsign", ...