Instructions.txt

using System;
using Microsoft.Build.Utilities;
using Microsoft.Build.Framework;
 
//C:\Windows\Microsoft.Net\Framework\v4.0.30319\csc.exe /r:"C:\Windows\Microsoft.Net\Framework\v4.0.30319\Microsoft.Build.Framework.dll"  /r:"C:\Windows\Microsoft.Net\Framework\v4.0.30319\Microsoft.Build.Utilities.v4.0.dll" /target:library /out:addtask.dll addtask.cs
 
namespace MyTasks
{
  public class AddTask : Task
  {
    private int number1;
  
    [Required]
    public int Number1
    {
      get { return number1; }
      set { number1 = value; }
    }
  
    private int number2;
  
    [Required]
    public int Number2
    {
      get { return number2; }
      set { number2 = value; }
    }
  
    private int sum;
  
    [Output]
    public int Sum
    {
      get { return sum; }
      set { sum = value; }
    }
  
    public override bool Execute()
    {
      try
      {
        sum = number1 + number2;
      }
      catch (ArithmeticException e)
      {
        Console.WriteLine("Error occured during addition: {0}", e.Message);
        return false;
      }
      return true;
    }
  }
}