C# Convert String to Byte Array and Byte Array to String

public static byte[] StrToByteArray(string str)
{
    System.Text.ASCIIEncoding  encoding = new System.Text.ASCIIEncoding();
    return encoding.GetBytes(str);
}

public static string ByteArrayToStr(byte[] byteArray)
{
  System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();
  return encoding.GetString(byteArray);
}