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How can I detect the encoding/codepage of a text file

I’ve been developing a winform system. And need to read txt file.

Unfortunately, there are many txt encoded files. I can’t read it use a specific encoding.

The problem is how to judge a txt file encoding.

Answer 1

In @Gens and @Samuel Neff cues, I solve the problem.
Here is my code.

public static Encoding GetFileEncoding(string srcFile)
{
 // *** Use Default of Encoding.Default (Ansi CodePage)
            Encoding encoding = Encoding.Default;
            using (FileStream stream = File.OpenRead(fileName))
            {
                // *** Detect byte order mark if any - otherwise assume default
                byte[] buff = new byte[5];
                stream.Read(buff, 0, buff.Length);
                if (buff[0] == 0xEF && buff[1] == 0xBB && buff[2] == 0xBF)
                {
                    encoding = Encoding.UTF8;
                }
                else if (buff[0] == 0xFE && buff[1] == 0xFF)
                {
                    encoding = Encoding.BigEndianUnicode;
                }
                else if (buff[0] == 0xFF && buff[1] == 0xFE)
                {
                    encoding = Encoding.Unicode;
                }
                else if (buff[0] == 0 && buff[1] == 0 && buff[2] == 0xFE && buff[3] == 0xFF)
                {
                    encoding = Encoding.UTF32;
                }
                else if (buff[0] == 0x2B && buff[1] == 0x2F && buff[2] == 0x76)
                {
                    encoding = Encoding.UTF7;
                }
            }
            return encoding;
}