Task Class

[SerializableAttribute]
public abstract class Task

<SerializableAttribute>
Public MustInherit Class Task

// You must always make the Task class serializable
[Serializable]
public class SimpleTask : Task
{
    // The instance of the class is automatically serialized with the task
    private int a;
    private int b;

    public SimpleTask(int first, int second)
    {
        a = first;
        b = second;
    }

    public override void Execute()
    {
        // Put your application logic in the Execute method
        Result = a + b;
    }
}