c# decoding byte[] doesnt detect null

Question

I'm trying to decode the following byte array:

byte[] buffer = { 0x31, 0x2e, 0x30, 0x31, 0x2e, 0x30, 0x30, 0x30, 0x00 };
Console.WriteLine(BitConverter.ToString(buffer));
string str = Encoding.ASCII.GetString(buffer);
Console.WriteLine(str);

the output as following:

31-2E-30-31-2E-30-30-30-00 and 1.01.000?

why there is a question mark in the decoded string !!

Edit shouldn't the ASCII decoder detect the string terminator (C-style) ?!

Answer 1

等待大神答复