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Using IO enumerations to control file behavior when writing a file (C#)

<%@ Page Language="C#" %> <%@ Import Namespace="System.IO" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server">     protected void Page_Load(object sender, EventArgs e)     {         FileStream fs = new FileStream(Server.MapPath("Data.txt"), FileMode.Append,                 FileAccess.Write, FileShare.Read, 0, FileOptions.Asynchronous);         byte[] data = System.Text.Encoding.ASCII.GetBytes("This is an additional string");         fs.Write(data, 0, (int)data.Length);         fs.Flush();         fs.Close();     } </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server">     <title>Untitled Page</title> </head> <body>     <form id="form1" runat="server">     <div>          </div>     </form> </body> </html>