Detect Encoding for In- and Outgoing Text

namespace MultiLanguage
{
    using System;
    using System.Runtime.CompilerServices;
    using System.Runtime.InteropServices;
    using System.Security;

    [ComImport, Guid("359F3443-BD4A-11D0-B188-00AA0038C969"), InterfaceType((short) 1)]
    public interface IMLangCodePages
    {
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void GetCharCodePages([In] ushort chSrc, out uint pdwCodePages);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void GetStrCodePages([In] ref ushort pszSrc, [In] int cchSrc, [In] uint dwPriorityCodePages, out uint pdwCodePages, out int pcchCodePages);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void CodePageToCodePages([In] uint uCodePage, out uint pdwCodePages);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType=MethodCodeType.Runtime)]
        void CodePagesToCodePage([In] uint dwCodePages, [In] uint uDefaultCodePage, out uint puCodePage);
    }
}