System.IO.Stream iStream  =   null ;             //  Buffer to read 10K bytes in chunk:              byte [] buffer  =   new  Byte[ 10240 ];             //  Length of the file:              int  length;             //  Total bytes to read:              long  dataToRead;             //  Identify the file to download including its path.              string  filepath   =   @" E:/software/SQL Server 2000 Personal Edition.ISO " ;             //  Identify the file name.              string   filename   =  System.IO.Path.GetFileName(filepath);             try              {                // Open the file.