C#

<br />
BASE c = null;<br />
Type t = Type.GetType("mytest.subBase");<br />
object o =  Activator.CreateInstance(t);<br />
c = o as subBase;<br />

class MyBaseClass
{
   abstract void DoSomething();
}

class MyConcreeteClass1 : MyBaseClass
{
  override coid DoSomething()
  {
    Console.WriteLine("From 1");
  }
}

class MyConcreeteClass2 : MyBaseClass
{
  override coid DoSomething()
  {
    Console.WriteLine("From 2");
  }
}

Type t1 = Type.GetType("MyConcreteClass1");<br />
Type t2 = Type.GetType("MyConcreteClass2");<br />
MyBaseClass o1 = (MyBaseClass)Activator.CreateInstance(t1);<br />
MyBaseClass o2 = (MyBaseClass)Activator.CreateInstance(t2);<br />
o1.DoSomething();<br />
o2.DoSomething();

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FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.ReadWrite);
BinaryReader br = new BinaryReader(fs);
BinaryWriter bw = new BinaryWriter(fs);
fs.Seek(123, SeekOrigin.Begin); // start reading with 123 bytes offset
byte[] buf = br.ReadBytes(16);
for (int i=0; i<buf.Length; i++)
  buf[i] ^= 128;
fs.Seek(123, SeekOrigin.Begin);
bw.Write(buf);
bw.Close(); // the underlying stream is closed as well
MessageBox.Show("Congratulations, you have ruined '"+filePath+"'!");