C# Signature:

[DllImport("Advapi32",SetLastError=false)]
static extern bool IsTextUnicode(byte[] buf, int len, ref IsTextUnicodeFlags opt);

VB Signature:

None

User-Defined Types:

    [Flags]
    enum IsTextUnicodeFlags:int
    {
        IS_TEXT_UNICODE_ASCII16           = 0x0001,
        IS_TEXT_UNICODE_REVERSE_ASCII16       = 0x0010,

        IS_TEXT_UNICODE_STATISTICS       = 0x0002,
        IS_TEXT_UNICODE_REVERSE_STATISTICS   = 0x0020,

        IS_TEXT_UNICODE_CONTROLS         = 0x0004,
        IS_TEXT_UNICODE_REVERSE_CONTROLS     = 0x0040,

        IS_TEXT_UNICODE_SIGNATURE        = 0x0008,
        IS_TEXT_UNICODE_REVERSE_SIGNATURE     =0x0080,

        IS_TEXT_UNICODE_ILLEGAL_CHARS    = 0x0100,
        IS_TEXT_UNICODE_ODD_LENGTH       = 0x0200,
        IS_TEXT_UNICODE_DBCS_LEADBYTE    = 0x0400,
        IS_TEXT_UNICODE_NULL_BYTES       = 0x1000,

        IS_TEXT_UNICODE_UNICODE_MASK    =  0x000F,
        IS_TEXT_UNICODE_REVERSE_MASK    =  0x00F0,
        IS_TEXT_UNICODE_NOT_UNICODE_MASK    =  0x0F00,
        IS_TEXT_UNICODE_NOT_ASCII_MASK      =  0xF000
    }

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Notes:

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