polygon Self intersection find in arcobjects

how to get self intersection polygons in arcobjects could you please tell me how to get already i got self intersection for polyline features as per below code but it is not working on polygon features

if (intF.Shape.GeometryType == esriGeometryType.esriGeometryPolyline)
{
    IPolyline pline = intF.Shape as IPolyline;
    ITopologicalOperator3 ptopo = pline as ITopologicalOperator3;
    esriNonSimpleReasonEnum reasen = esriNonSimpleReasonEnum.esriNonSimpleSelfIntersections;
    ptopo.IsKnownSimple_2 = false;
    if (!ptopo.get_IsSimpleEx(out reasen))
    {
    if (reasen == esriNonSimpleReasonEnum.esriNonSimpleSelfIntersections)
    {

        selfinterfind = true;
    }
    }
    if (selfinterfind == true)
    {
    dt.Rows.Add(intF.OID, intF.Class.AliasName, "", "Self Intersection Found");
    }
}