using System;
using System.Windows.Forms;
using System.IO;
class MainClass
{
public static void SaveMemoryStream(MemoryStream ms, string FileName)
{
FileStream outStream = File.OpenWrite(FileName);
ms.WriteTo(outStream);
outStream.Flush();
outStream.Close();
}
public static void Main()
{
FileStream inStream = File.OpenRead("c:\\text.txt");
MemoryStream storeStream = new MemoryStream();
storeStream.SetLength(inStream.Length);
inStream.Read(storeStream.GetBuffer(), 0, (int)inStream.Length);
storeStream.Flush();
inStream.Close();
SaveMemoryStream(storeStream, "C:\\text.txt" + ".bak");
storeStream.Close();
}
}