Function GetStatusNum(Num : Integer) : Integer;export; stdcall;
begin
 if Num in [1..6] then GetStatusNum:=StatusBuf[Num]
  else GetStatusNum:=0;
end;

        [DllImport("Azimuth.dll", CallingConvention = CallingConvention.StdCall, EntryPoint = "GetStatusNum")]
        public static extern int GetStatusNum(int byte1);// 1-6

 [DllImport("Azimuth.dll", CallingConvention = CallingConvention.StdCall, CharSet = CharSet.Ansi, EntryPoint = "GetFldStr")]
        public static extern IntPtr _GetFldStr(byte Num, IntPtr Field);
        public static string GetFldStr(byte Num, string Field)
        {
            try
            {
                IntPtr pfield = Marshal.StringToHGlobalAnsi(Field);

                IntPtr pstr = _GetFldStr(Num, pfield);
                string val = Marshal.PtrToStringAnsi(pstr);
                Marshal.FreeHGlobal(pfield);

                return val;
            }
            catch (Exception)
            {
                throw;
            }
        }

Marshal.FreeHGlobal(pstr);

 [DllImport("Azimuth.dll", CallingConvention = CallingConvention.StdCall, CharSet = CharSet.Ansi, EntryPoint = "ExceptToLog")]
        public static extern int _ExceptToLog(IntPtr Msg);
        public static int ExceptToLog(string Msg)
        {
            try
            {
                IntPtr d = Marshal.StringToHGlobalAnsi(Msg);

                int val = _ExceptToLog(d);

                Marshal.FreeHGlobal(d);

                return val;
            }
            catch (Exception)
            {
                throw;
            }
        }

 catch (Exception)
            {
[color=red]                //throw; Убрал это[/color]
            }