Write text files without Byte Order Mark (BOM) ?

Question

I am trying to create a text file using VB.Net with UTF8 encoding, without BOM. Can anybody help me, how to do this?
I can write file with UTF8 encoding but, how to remove Byte Order Mark from it?
Thanks in Advance. edit1: I have tried code like this;

    Dim utf8 As New UTF8Encoding()
    Dim utf8EmitBOM As New UTF8Encoding(True)
    Dim strW As New StreamWriter("c:\temp\bom\1.html", True, utf8EmitBOM)
    strW.Write(utf8EmitBOM.GetPreamble())
    strW.WriteLine("hi there")
    strW.Close()

        Dim strw2 As New StreamWriter("c:\temp\bom\2.html", True, utf8)
        strw2.Write(utf8.GetPreamble())
        strw2.WriteLine("hi there")
        strw2.Close()

1.html get created with UTF8 encoding only and 2.html get created with ANSI encoding format.

Answer 1

There seems to be a way of omitting the byte order mark (BOM) via passing False True to the UTF8Encoding constructor (link to MSDN reference page).

That is, use your own instance of UTF8Encoding instead of the default System.Text.Encoding.UTF8:

Dim utf8WithoutBom As New System.Text.UTF8Encoding(True)
                                                  '^^^^'

Using sink As New StreamWriter("Foobar.txt", False, utf8WithoutBom)
    sink.WriteLine("...")
End Using

(Note that omitting the BOM is only permissible for UTF-8, not for UTF-16.)

Answer 2

It might be that your input text contains a byte order mark. In that case, you should remove it before writing.

Answer 3

Try this:

Encoding outputEnc = new UTF8Encoding(false); // create encoding with no BOM
TextWriter file = new StreamWriter(filePath, false, outputEnc); // open file with encoding
// write data here
file.Close(); // save and close it