C#

class MyGenericClass<T> : ICloneable where T: class, new()
{

private T  m_storedClass;
...

private DoStuff()
{
   //do stuff for all types

   //objects of SpecialType need extra stuff done.
   if (typeof(T) == typeof(SpecialType))
   {
      //compiler error:  Error Cannot convert type 'T' to 'SpecialType'
      ((SpecialType)m_storedClass).SpecialString = "foo";
   }
}

Dialog_FormClosing(.....)
{
   try
   {
      Console.WriteLine("closing");
      if(!can_close)
      {
         Messagebox.Show("You have to finish your app first");
         e.Cancel = true;
      }
      else
      {
         e.Cancel = false;
      }
   }
   catch
   {
   }
}

public delegate void SpliiterMovedEventHandler(object sender, SplitterMovedEventArgs e);

public partial class _Splitter : UserControl
{
    private bool _bDragging = false;
    private int _OldPosition = 0;

    public _Splitter()
    {
        InitializeComponent();
        _OldPosition = this.Top;
    }


    public event SpliiterMovedEventHandler SplitterMoved;
    protected void OnSpliiterMoved()
    {
        if (SplitterMoved != null)
        {
            SplitterMovedEventArgs args = new SplitterMovedEventArgs(_OldPosition, this.Top);
            SplitterMoved(this, args);
        }
    }


    private void _Splitter_MouseDown(object sender, MouseEventArgs e)
    {
        // If the user has the left button down...
        if (e.Button == MouseButtons.Left)
        {
            // Turn on the dragging flag
            _bDragging = true;

            // Store the old position
            _OldPosition = this.Top;

            // Change the cursor
            this.Cursor = Cursors.SizeNS;
            
            // Start the drag operation
            this.DoDragDrop(sender, DragDropEffects.Copy);
        }
    }
    private void _Splitter_MouseMove(object sender, MouseEventArgs e)
    {
        // If dragging...
        if (_bDragging)
        {
            // Set the cursor to display while moving
            this.Cursor = Cursors.SizeNS;

            // Keep the splitter aligned to the left
            this.Left = 0;
        }
    }
    private void _Splitter_MouseUp(object sender, MouseEventArgs e)
    {
        if (_bDragging)
        {
            // Turn off the dragging flag
            _bDragging = false;

            // Reset the cursor
            this.Cursor = Cursors.Default;

            // Raise the event
            OnSpliiterMoved();

            // Store the new position
            _OldPosition = this.Top;
        }
    }
    private void _Splitter_MouseLeave(object sender, EventArgs e)
    {
        // Reset the cursor
        this.Cursor = Cursors.Default;
    }
    private void _Splitter_GiveFeedback(object sender, GiveFeedbackEventArgs e)
    {
        // Tell the control not to use the default move curosr
        e.UseDefaultCursors = false;

        // Set the cursor
        this.Cursor = Cursors.SizeNS;
    }
    private void _Splitter_MouseEnter(object sender, EventArgs e)
    {
        // Set the cursor
        this.Cursor = Cursors.SizeNS;
    }
}