using System;
using System.Collections.Generic;
using System.Linq;
using System.Xml.Linq;

public class LINQtoXML
{
    public static void Main(string[] args)
    {
        XDocument doc = XDocument.Load("StudentInfo.xml");

        //PrintElement(doc.Root, 0);

        // Select a specific element

        var elements =
            from el in doc.Descendants("courseInfo")
            select el;

        foreach (var e in elements)
            PrintElement(e, 0);

        Console.WriteLine();

        var elements1 =
            from e2 in doc.Descendants("courseInfo").Elements()
            where e2.Name.LocalName.StartsWith("c")
            select e2;

        foreach (var e in elements1)
            PrintElement(e, 0);


    }

    private static void PrintElement(XElement element, int indentLevel)
    {
        string name = element.Name.LocalName;

        Indent(indentLevel);
        Console.WriteLine('<' + name + '>');

        if (element.HasElements)
        {
            foreach (var child in element.Elements())
                PrintElement(child,indentLevel+1);
        }
        else
        {
            Indent(indentLevel+1);
            Console.WriteLine(element.Value.Trim());
        }

        Indent(indentLevel);
        Console.WriteLine("</" + name + '>');
    }

    private static void Indent(int level)
    {
        for (int i = 0; i < level; i++)
            Console.Write("     ");
    }

}