C#

Stream s = File.OpenWrite("<filepath>");

foreach (Student student in studentList)
{
    xmlSerializer.Serialize(s, student);
}

s.Flush();
s.Close();
</filepath>

public class StudentCollection : List<student>
{
    //
}
public static List<student> DeSerialize()
{
    // DeSerialize here
}

public new void Add(Student student)
{
    // Do validation and duplication checks here
    base.Add(student);
    Serialize(this);
}
public static void Serialize(List<student> studentCollection)
{
    // Serialize here;
}

CodingYoshi wrote:

deserialize all students from file into a collection, add new students to collection and reserialize

public abstract class ImageBase
{
  public int X { get; set; }
  public int Y { get; set; }
  public int Width { get; set; }
  public int Height { get; set; }
  // More properties

  public virtual ImageBase Save()
  {
  }

  public virtual void Load(/* some form of stream */ item)
  {
    // Rehydrate the object from the stream.
  }
}

string msg = "Hi Jocey!! I Hope you have a stupendous 30th birthday! I'm aorry I can't make it! Suexoxo";

List<string> lines = new List<string>();
while (msg.Length > 30) {
	int pos = msg.LastIndexOf(' ', 29, 30);
	if (pos != -1) {
		lines.Add(msg.Substring(0, pos).PadRight(30));
		msg = msg.Substring(pos + 1);
	} else {
		lines.Add(msg.Substring(0, 30));
		msg = msg.Substring(30);
	}
}
lines.Add(msg.PadRight(30));

foreach (string s in lines) Console.WriteLine("\""+s+"\"");</string></string>

public struct _ABC
{
[FieldOffset(0)]
public int a;

[FieldOffset(4)]
public short b;

[FieldOffset(6)]
public int c;

[FieldOffset(6)]
public int d;
}

_ABC test;
test.d = 0;
test.c = 5;
Console.WriteLine("d = {0}", test.d);

d = 5

[System.Runtime.InteropServices.StructLayout(LayoutKind.Explicit)]