Comments by dimitrievg (Top 1 by date)

Thanks! It also helped me during solving of analogous problem of cyrillic WM_CHAR. May be I am wrong but it works.
[DllImport("user32.dll", EntryPoint = "SendMessageW")]
public static extern void SendMessageW(IntPtr hWnd, UInt32 msg, [MarshalAs(UnmanagedType.U1)] char wParam, int lParam);