Find difference between two custom list objects

public class details     {         public string classname;         public list<student> studentcollection;     }     public class student     {         public string rollnumber, name;         public list<marks> studentmarks;     }     public class marks     {         public string eng, maths, term;     }
old xml ---------- <details> 			<class>1.0</class> 			<student  rollnumber="001" name="aaa"> 				<marks eng="50" maths="50" term="first"/> 				<marks eng="60" maths="57" term="second"/> 				<marks eng="55" maths="56" term="third"/> 				<marks eng="59" maths="85" term="fourth"/> 			</student> 			<student  rollnumber="002" name="baa"> 				.... 			</student> </details> new xml ---------- <details> 			<class>1.0</class> 			<student  rollnumber="001" name="aaa"> 				<marks eng="50" maths="60" term="first"/> 				<marks eng="60" maths="57" term="second"/> 				<marks eng="55" maths="46" term="third"/> 				<marks eng="59" maths="85" term="fourth"/> 			</student> 			<student  rollnumber="002" name="baa"> 				.... 			</student> </details>
 
hi all, using xelement.load have loaded xml above class. class  , xml structure given above.
i have requirement have  compare 2 xml files. in hte new xml, marks student(s) might change particular term(s). 
i need identify student , term eth marks has been chnaged.
can u plz let me knwo how difference between tow list<marks> object.
i holding hte object like,
details olddetails = getdetails(path1);
details newdetails = getdetails(path2);
thanks,

put data datable , compare tables shown on webpage below

http://stackoverflow.com/questions/6187140/compare-two-datatable-in-c-sharp

the code below load 2 datatables

using system; using system.collections.generic; using system.linq; using system.text; using system.xml; using system.xml.linq; using system.data; namespace consoleapplication2 { class program     {         static string input1 =              "<details>\n" +             "<class>1.0</class>\n" + 			"<student  rollnumber=\"001\" name=\"aaa\">\n" + 			"<marks eng=\"50\" maths=\"50\" term=\"first\"/>\n" + 			"<marks eng=\"60\" maths=\"57\" term=\"second\"/>\n" + 			"<marks eng=\"55\" maths=\"56\" term=\"third\"/>\n" + 			"<marks eng=\"59\" maths=\"85\" term=\"fourth\"/>\n" + 			"</student>" + 			"<student  rollnumber=\"002\" name=\"baa\">\n" +     		"<marks eng=\"50\" maths=\"50\" term=\"first\"/>\n" + 			"<marks eng=\"60\" maths=\"57\" term=\"second\"/>\n" + 			"<marks eng=\"55\" maths=\"56\" term=\"third\"/>\n" + 			"<marks eng=\"59\" maths=\"85\" term=\"fourth\"/>\n" + 			"</student>\n" +             "</details>\n";         static string input2 =             "<details>\n" +             "<class>1.0</class>\n" +             "<student  rollnumber=\"001\" name=\"aaa\">\n" +             "<marks eng=\"50\" maths=\"60\" term=\"first\"/>\n" +             "<marks eng=\"60\" maths=\"57\" term=\"second\"/>\n" +             "<marks eng=\"55\" maths=\"46\" term=\"third\"/>\n" +             "<marks eng=\"59\" maths=\"85\" term=\"fourth\"/>\n" +             "</student>" +             "<student  rollnumber=\"002\" name=\"baa\">\n" +             "<marks eng=\"50\" maths=\"50\" term=\"first\"/>\n" +             "<marks eng=\"60\" maths=\"57\" term=\"second\"/>\n" +             "<marks eng=\"55\" maths=\"56\" term=\"third\"/>\n" +             "<marks eng=\"59\" maths=\"85\" term=\"fourth\"/>\n" +             "</student>\n" +             "</details>\n";         static void main(string[] args)         {             xdocument doc;             doc = new xdocument();             doc = xdocument.parse(input1);             dataset set1 = new dataset();             set1.readxml(doc.createreader());             doc = new xdocument();             doc = xdocument.parse(input2);             dataset set2 = new dataset();             set2.readxml(doc.createreader());         }     } }

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jdweng

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