my merge(留作纪念)

 private void button11_Click(object sender, EventArgs e)
        {
            IWorkspaceEdit pWorkspaceEdit = (IWorkspaceEdit)pCommonFeaureWorkspace;
            pWorkspaceEdit.StartEditing(true);
            pWorkspaceEdit.StartEditOperation();

            IFeatureCursor pFeatureCursor = pCommonFeatureClass.Search(null, false);
            IFeature pFeatureFirst = pFeatureCursor.NextFeature();
            //int count = 0;
            //while (pFeatureFirst != null)
            //{
                Console.WriteLine(pFeatureFirst.get_Value(0).ToString());

                IGeometry pGeometryFirst = pFeatureFirst.Shape;
                ITopologicalOperator2 pTopOperatorFirst = (ITopologicalOperator2)pGeometryFirst;
                IRelationalOperator pRelOperatorFirst = (IRelationalOperator)pGeometryFirst;
                pTopOperatorFirst.IsKnownSimple_2 = false;
                pTopOperatorFirst.Simplify();
                pGeometryFirst.SnapToSpatialReference();

                IGeometry pGeometrySecond;
                IFeature pFeatureSecond = pFeatureCursor.NextFeature();

                while (pFeatureSecond != null)
                {
                    pGeometrySecond = pFeatureSecond.ShapeCopy;
                    ITopologicalOperator2 pTopOperatorSecond = (ITopologicalOperator2)pGeometrySecond;
                    pTopOperatorSecond.IsKnownSimple_2 = false;
                    pTopOperatorSecond.Simplify();
                    pGeometrySecond.SnapToSpatialReference();
                    Console.WriteLine(pFeatureSecond.get_Value(0).ToString());

                    if (pRelOperatorFirst.Overlaps(pGeometrySecond) == true)
                    {
                        pGeometryFirst = pTopOperatorFirst.Union(pGeometrySecond);
                        pFeatureSecond.Delete();
                    }

                    pFeatureSecond = pFeatureCursor.NextFeature();
                }

                pTopOperatorFirst.IsKnownSimple_2 = false;
                pTopOperatorFirst.Simplify();
                pFeatureFirst.Shape = pGeometryFirst;
                pFeatureFirst.Store();
                //axMapControl1.Refresh();
                //count++;

            //    pFeatureCursor = pCommonFeatureClass.Search(null, false);
            //    for (int i = 0; i <= count; i++)
            //    {
            //        pFeatureFirst = pFeatureCursor.NextFeature();
            //    }
            
            //}
            pWorkspaceEdit.StopEditOperation();
            pWorkspaceEdit.StopEditing(true);
            axMapControl1.Refresh();
        }