How to use IGeometryBag

By using this GeometryBag you can selected multiple object within another geometry object. this method give you fast result.

public IGeometryBag Create_GeometryBag_from_FeatureClass(IFeatureClass pFeatureClass)

{
    IGeometryBag pGeometryBag = new GeometryBagClass();
    IGeoDataset pGeoDataset = (IGeoDataset)pFeatureClass;
    ISpatialReference pSpatialReference = pGeoDataset.SpatialReference;
    pGeometryBag.SpatialReference = pSpatialReference;
    IGeometryCollection pGeometryCollection = (IGeometryCollection)pGeometryBag;
    object MissingType = Type.Missing;
    IFeatureCursor pFeatureCursor = pFeatureClass.Search(null, false);
    IFeature pFeature = pFeatureCursor.NextFeature();
    while (pFeature != null)
    {
       pGeometryCollection.AddGeometry(pFeature.Shape, ref MissingType, ref MissingType);
       pFeature = pFeatureCursor.NextFeature();
    }
    Marshal.ReleaseComObject(pFeatureCursor);
    return pGeometryBag;
}