Appending multiple RTF file into one

[amitp]

Can anyone help me out in this? I want to append multiple RTF file into one RTF file. I tried using 'streamwriter', the resulting file size becomes big and when i open it, it is the original i.e the first RTF file only and not the appended one. But i open the file with notepad it looks appended. I've supplied my code below . I've searched thru internet a lot but didn't get anything. So if anybody hav a solution plz help me out.

I'll explain something 'bout the code.
File in path1 is a new blank file i.e to b created.
File in path2 and path3 have contents.

using system;
using system.IO;

try
{
string path1 = @"C:\amit.rt f";
string path2 = @"C:\T0000072.r tf";
string path3 = @"C:\T0000073.r tf";
FileStream file2 = new FileStream(path 2, FileMode.OpenOr Create, FileAccess.Read Write);
FileStream file3 = new FileStream(path 3, FileMode.OpenOr Create, FileAccess.Read Write);
StreamReader sr2 = new StreamReader(fi le2);
StreamReader sr3 = new StreamReader(fi le3);
string s = sr2.ReadToEnd() ;
string s1 = sr3.ReadToEnd() ;
StreamWriter sw1 = new StreamWriter(pa th1);
sw1.WriteLine(s );
sw1.WriteLine(s 1);
sw1.Close();
sr2.Close();
sr3.Close();
}
catch(Exception ex)
{
Console.WriteLi ne(ex.Message.T oString());
}