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public static IGeometry CreatePolygonfromRing(IRing ExRing)
{
ISegmentCollection SegCol= ExRing as ISegmentCollection;
IPolygon PPolygon =new PolygonClass();
ISegmentCollection newSegCol = PPolygon as ISegmentCollection;
newSegCol.AddSegmentCollection(SegCol);
return PPolygon as IGeometry;
}