C#

<br />
string[] files = Directory.GetFiles(workingDirectory);<br />
<br />
foreach (string s in files)<br />
{<br />
FileInfo fi = new FileInfo(s);<br />
fi.Extension//the desired method for use<br />
//and if necessary , Switch to catch desired file typess<br />

byte[] MyArray = null;
const int MaxSize = 1000;
string FilePath = @"C:\test.txt";
FileInfo MyFile = new FileInfo(FilePath);

if (MyFile.Length > MaxSize)
  MyArray = new byte[MaxSize];
else
  MyArray = new byte[MyFile.Length];

foreach (IDisposable disposableObject in listOfVariousClassInstances)
{
   disposableObject.Dispose();
}

public class Base
{
   protected int i;

   public int I
   {
      get:
      {
         return i;
      }
   }
}

public class A: Base
{
   protected int j;

   public int J
   {
      get:
      {
         return j;
      }
   }
}

public class B: Base
{
   protected int k;

   public int K
   {
      get:
      {
         return k;
      }
   }
}

public interface IBase
{
   int I
   {
      get;
   }
}

public class A: IBase
{
   protected int j;
   protected int i;

   public int I
   {
      get:
      {
         return i;
      }
   }

   public int J
   {
      get:
      {
         return j;
      }
   }
}

public class B: ArrayList, IBase
{
   protected int k;
   protected int i;

   public int I
   {
      get:
      {
         return i;
      }
   }

   public int K
   {
      get:
      {
         return k;
      }
   }
}