ArcMapAddinCoordinateConversion.ViewModels.MainViewModel.GetMGRSPolygon C# (CSharp) Method

        private IPolygon GetMGRSPolygon(IPoint point)
        {
            CoordinateMGRS mgrs;

            IPointCollection pc = new RingClass();

            // bottom left
            CoordinateMGRS.TryParse(InputCoordinate, out mgrs);

            // don't create a polygon for 1m resolution
            if (mgrs.Easting.ToString().Length > 4 && mgrs.Northing.ToString().Length > 4)
                return null;

            var tempPoint = new PointClass() as IConversionNotation;
            (tempPoint as IPoint).SpatialReference = GetSR();
            var anotherMGRSstring = mgrs.ToString("", new CoordinateMGRSFormatter());
            tempPoint.PutCoordsFromMGRS(anotherMGRSstring, esriMGRSModeEnum.esriMGRSMode_Automatic);
            pc.AddPoint(tempPoint as IPoint);

            // top left
            var tempMGRS = new CoordinateMGRS(mgrs.GZD, mgrs.GS, mgrs.Easting, mgrs.Northing);
            var tempEasting = mgrs.Easting.ToString().PadRight(5,'0');
            tempMGRS.Easting = Convert.ToInt32(tempEasting);
            var tempNorthing = mgrs.Northing.ToString().PadRight(5,'9');
            tempMGRS.Northing = Convert.ToInt32(tempNorthing.Replace('0','9'));

            tempPoint = new PointClass() as IConversionNotation;
            (tempPoint as IPoint).SpatialReference = GetSR();
            anotherMGRSstring = tempMGRS.ToString("ZSX00000Y00000", new CoordinateMGRSFormatter());
            tempPoint.PutCoordsFromMGRS(anotherMGRSstring, esriMGRSModeEnum.esriMGRSMode_Automatic);
            pc.AddPoint(tempPoint as IPoint);

            // top right
            tempEasting = mgrs.Easting.ToString().PadRight(5,'9');
            tempMGRS.Easting = Convert.ToInt32(tempEasting.Replace('0', '9'));
            tempNorthing = mgrs.Northing.ToString().PadRight(5,'9');
            tempMGRS.Northing = Convert.ToInt32(tempNorthing.Replace('0', '9'));

            tempPoint = new PointClass() as IConversionNotation;
            (tempPoint as IPoint).SpatialReference = GetSR();
            tempPoint.PutCoordsFromMGRS(tempMGRS.ToString("ZSX00000Y00000", new CoordinateMGRSFormatter()), esriMGRSModeEnum.esriMGRSMode_Automatic);
            pc.AddPoint(tempPoint as IPoint);

            // bottom right
            tempEasting = mgrs.Easting.ToString().PadRight(5,'9');
            tempMGRS.Easting = Convert.ToInt32(tempEasting.Replace('0', '9'));
            tempNorthing = mgrs.Northing.ToString().PadRight(5,'0');
            tempMGRS.Northing = Convert.ToInt32(tempNorthing);

            tempPoint = new PointClass() as IConversionNotation;
            (tempPoint as IPoint).SpatialReference = GetSR();
            tempPoint.PutCoordsFromMGRS(tempMGRS.ToString("ZSX00000Y00000", new CoordinateMGRSFormatter()), esriMGRSModeEnum.esriMGRSMode_Automatic);
            pc.AddPoint(tempPoint as IPoint);

            // create polygon
            var poly = new PolygonClass();
            poly.SpatialReference = GetSR();
            poly.AddPointCollection(pc);
            poly.Close();

            return poly;
        }