Getting “” at the beginning of my XML File after save() [duplicate]

It is the UTF-8 BOM, which is actually discouraged by the Unicode standard:

http://www.unicode.org/versions/Unicode5.0.0/ch02.pdf

Use of a BOM is neither required nor
recommended for UTF-8, but may be
encountered in contexts where UTF-8
data is converted from other encoding
forms that use a BOM or where the BOM
is used as a UTF-8 signature

You may disable it using:

var sw = new IO.StreamWriter(path, new System.Text.UTF8Encoding(false));
doc.Save(sw);
sw.Close();