ASP.NET 1.1及2.0的RegularExpressionValidator都無法指定是否區分大小寫(RegexOptions.IgnoreCase)。

要檢查上傳的副檔名，其正規表示式如下
^[a-zA-Z]:(\\.+)(\.pps|\.sql|\.dat)$ 　

為處理大小寫須改成
^[a-zA-Z]:(\\.+)(\.[pP][pP][sS]|\.[sS][qQ][lL]|\.[dD][aA][tT])$

可用程式
filter = "\.ppt|\.sql|\.dat";
for ( int i='a'; i<='z' ; i++ )
{
  string ls = new string((char)i,1);
  string us = new string((char)(i-32),1);
  filter = filter.Replace(ls,"["+ls+us+"]");
} // for
RegularExpressionValidator1.ValidationExpression = @"^[a-zA-Z]:(\\.+)("+filter+")$";

目標：由playlist.mp3控制播放內容（可空或多首），播完10秒後重新載入本頁。

說明：

1. playlist.mp3可以是真的mp3音樂檔，或是內容為多首mp3網址（一行一首）的文字檔。
2. playlist.mp3的內容由server端控制，可依警報或時間或隨機產生內容。

接收PlayStateChange[msdn]事件

參考資料：

• Windows Media Player Reference - W3Schools
• Using the Windows Media Player Control with Firefox - MSDN
• Player.playState - MSDN

  Value	State	Description
  0	Undefined	Windows Media Player is in an undefined state.
  1	Stopped	Playback of the current media item is stopped.
  2	Paused	Playback of the current media item is paused. When a media item is paused, resuming playback begins from the same location.
  3	Playing	The current media item is playing.
  4	ScanForward	The current media item is fast forwarding.
  5	ScanReverse	The current media item is fast rewinding.
  6	Buffering	The current media item is getting additional data from the server.
  7	Waiting	Connection is established, but the server is not sending data. Waiting for session to begin.
  8	MediaEnded	Media item has completed playback.
  9	Transitioning	Preparing new media item.
  10	Ready	Ready to begin playing.
  11	Reconnecting	Reconnecting to stream.

• ASX Elements Reference - MSDN
  Advanced Stream Redirector (ASX) files are based on the Extensible Markup Language (XML) syntax, and are made up of various elements with their associated tags and attributes.