Incorrect value after conversion

This is in reference to the thread http://ift.tt/1SNdoTg
I have a stringbuilder initialized with same value
If i ceck (example) the value to thirteenth position

Code:

  Asc(buffer_st.ToString.SubString2(12,13))  

the value is correct = 193 (0xc1)
but after conversion into buffer (byte)

Code:

  Dim b() As Byte
If buffer_st.Length = 0 Then Return
b = conv.StringToBytes(buffer_st, "UTF8")  

the value to thirteenth position is -61...

Incorrect value after conversion

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