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Reading and writing binary data (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)     {         BinaryWriter binarywriter = new BinaryWriter(File.Create(@"Data.dat"));         binarywriter.Write("a string");         binarywriter.Write(0x12346789abcdef);         binarywriter.Write(0x12345678);         binarywriter.Write('c');         binarywriter.Write(1.5f);         binarywriter.Write(100.2m);         binarywriter.Close();         BinaryReader binaryreader = new BinaryReader(File.Open(@"Data.dat", FileMode.Open));         string a = binaryreader.ReadString();         long l = binaryreader.ReadInt64();         int i = binaryreader.ReadInt32();         char c = binaryreader.ReadChar();         float f = binaryreader.ReadSingle();         decimal d = binaryreader.ReadDecimal();         binaryreader.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>