C#

protected void OnClosing(CancelEventArgs e)
{
     // Call the base implementation.
     base.OnClosing(e);

     // Set the Cancel property of the CancelEventArgs to true.
     e.Cancel = true;

     // Minimize the form here.
     this.WindowState = FormWindowState.Minimized;

     // That's all.
     return;
}

protected override void WndProc(ref Message m)
{
  const int WM_ENDSESSION = 0x0016;
 
  switch(m.Msg)
  {
    case WM_ENDSESSION:
      bool sessionEnding = (bool) m.WParam;
 
      // process EndSession
      m.Result = 0;
      break;

    default:
      base.WndProc(ref m);
  }
}

[DllImport("user32.dll")]<br />
public static extern int SetSysColors(int nChanges, ref int lpSysColor, ref int lpColorValues);

int iElement = 4;<br />
int iColor = 13160660;<br />
iRes = SetSysColors(1, ref iElement, ref iColor);

if( theObject is ISomething )<br />
{<br />
<br />
}

bool IsBDerivedFromA(object a, object b)
{
  Type ta = a.GetType();
  Type tb = b.GetType();
 
  // NOTE: Returns false if a and b are of the 
  // same type, like two strings, two ints,
  // two Foos, etc
  return tb.IsSubclassOf(a);  
}