如何判断Page.Response.WriteFile(file.FullName)写文件是否已经结束？

Question

如何判断Page.Response.WriteFile(file.FullName)写文件是否已经结束？

Answer 1

HttpResponse.WriteFile 方法 (String)  C#
将指定的文件直接写入 HTTP 内容输出流。
[Visual Basic]
Overloads Public Sub WriteFile( _
   ByVal filename As String _
)
[C#]
public void WriteFile(
   string filename
);参数
filename 
要写入 HTTP 输出的文件名。 
示例
[Visual Basic, C#] 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
下面的示例将名为“login.txt”的文本文件（可能包含 HTML 文本和输入控件）的所有内容直接写入输出流。
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
[Visual Basic] 
Response.Write("Please Login: <br>")
 Response.WriteFile("login.txt")
[C#] 
Response.Write("Please Login: <br>");
 Response.WriteFile("login.txt");
Response.WriteFile是把参数文件的内容写向浏览器 ！！