本文转载：http://www.cnblogs.com/LoveJenny/archive/2013/03/13/2956922.html
看到try,finally ,有没有让你想到什么呢？，对了using 可以生成try-finally
public class WaitCursor : IDisposable
{
private Cursor cursor;
public WaitCursor()
{
this.cursor = Cursor.Current;
Cursor.Current = Cursors.WaitCursor;
}
public void Dispose()
{
Cursor.Current = cursor;
}
}
使用的时候，只需要：
private void button1_Click(object sender, EventArgs e)
{
using(new WaitCursor())
{
LongTimeMethod();
}
}