文本和字节数组的相互转换

文本转换为字节数组：

    Private Function ConvertToByteArray(MyString As String) As Byte()
        Return System.Text.Encoding.UTF8.GetBytes(MyString)
    End Function

字节数组转换为文本：

    Private Function ConvertToString(ByteArray As Byte()) As String
        Return System.Text.Encoding.UTF8.GetString(ByteArray)
    End Function