stuck with class structure in windows 8 app development. Help ASAP!

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deserialization

Hi,
Required: I want an xml file to be searialized like this

<StudentGroupList>
   <Group key = 1>
      <StudentItem>
           <Name> John </Name>
           <GroupName>1</GroupName>
      <StudentItem>
      <StudentItem>
           <Name> David</Name>
           <GroupName>1</GroupName>
      <StudentItem>
   </Group>
   <Group key = 2>
      <StudentItem>
           <Name> Ron</Name>
           <GroupName>2</GroupName>
      <StudentItem>
   </Group>
 </StudentGroupList>

Here is the class structure i created to serialize and desreialize

public class StudentItem
{
   public string Name {get; set;}
   public  int GroupName {get; set;}
}

public class StudentGroupList
{
   public List<StudentItem> lstStudnetItem = new List<StudentItem>(){get;set;}
   int key {get;set;}
}
public class StudentDataSource
{
       public List<StudentGroupList> lstStudnetGroup = new List<StudentGroupList>()   {get;set;}
      //Confusion in below line
      public static StudentDataSource objDataSource = new  StudentDataSource();
}

i have created single instance of StudentDataSource so that i can use it globally on every page of my windwos 8 aap. i want to use single instance because this instance will desrialize from the xml file above and simultaneously update it as soon as any changes are made. Now as u see i have made this instance as static i can't access the "lstStudnetGroup".
Please provide me a solution of class structure so that i can easily create an aap.

Quote:

please forgive my representation, its the first time i am writing on any blog for help.