Q:

how to read special character like é, â and others in C#

I can't read those special characters 
I tried like this
1st way #
string xmlFile = File. ReadAllText(fileName);

2nd way #
FileStream fs = new FileStream(fileName, FileMode. Open, FileAccess. Read);
StreamReader r = new StreamReader(fs);
string s = r.ReadToEnd();

But both statements don't understand those special characters. 
How should I read? 
UPDATE ###
I also try all encoding with 
string xmlFile = File. ReadAllText(fileName, Encoding. ); 

but still don't understand those special characters. 

A:

There is no such thing as "special character".  What those likely are is extended ascii characters from the latin1 set (iso-8859-1). 
You can read those by supplying encoding explicitly to the stream reader (otherwise it will assume UTF8)
using (StreamReader r = new StreamReader(fileName, Encoding. GetEncoding("iso-8859-1")))
    r.ReadToEnd();

A:

StreamReader sr = new StreamReader(stream, Encoding. UTF8)

A:

You have to tell the StreamReader that you are reading Unicode like so
StreamReader sr = new StreamReader(stream, Encoding. Unicode);

If your file is of some other encoding, specify it as the second parameter

