Hello everyon

I am using filestream and streamwriter to download and save a xml page from the internet
The problem is that it has 3 bytes at the beginning of the file with garbage that i want to get rid off
so i use a simple code like this

        FileStream* fs1 = new FileStream (input, FileMode::Open, FileAccess::ReadWrite)
        StreamReader* sr1 = new StreamReader (fs1)
        StreamWriter* sw1 = new StreamWriter(fs1)

char c = ' '
for (;;

    c = sr1->Read()
   if (c == '<'
   
        sw1 ->Flush()
        sw1 ->Close()
        break
   
  els
   
        sw1 ->Write(' ')
   

Although the read is done correctly, the write does not appear to function

I don't know whether this code starts the write at the beggining of the file, is there a way to make sure of that
Then is a special function or character for deleting the unwanted characters that i find ?