# Union Two Features **URL:** \ **Category:** WebForms\ **Created:** [January 2, 2012, 2:18pm UTC](https://community.thinkgeo.com/t/union-two-features/6082 "2012-01-02T14:18:58Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![shwe](https://community.thinkgeo.com/letter_avatar_proxy/v4/letter/s/ed8c4c/32.png) [@shwe](https://community.thinkgeo.com/u/shwe)\ **Post date:** [January 2, 2012, 2:18pm UTC](https://community.thinkgeo.com/t/union-two-features/6082/1 "2012-01-02T14:18:58Z")
Hello,  I have zip codes in my SalesArea and I need to merge(union) the zips codes of a SalesArea at the time displaying so that it will have only one boundry line.  I create SalesArea in "InMemoryFeatureLayer" and display them.  Union of features works as in the sample code. I also have developed using provided sampe code in my project and it works. But developing almost exactly the same to merge(union) for my own zip codes does not work. e.g. this is from sample code that i tried in my project and it works. `AreaBaseShape targetShape = (AreaBaseShape)saLayer.InternalFeatures["AreaShape1"].GetShape();saLayer.Open();saLayer.EditTools.BeginTransaction();saLayer.EditTools.Union("AreaShape2", targetShape);saLayer.EditTools.Delete("AreaShape1");saLayer.EditTools.CommitTransaction();saLayer.Close();` And this is the same development for merging (union) of my zip codes ( features). It does not work. `AreaBaseShape targetSA = (AreaBaseShape)saLayer.InternalFeatures["08812"].GetShape();saLayer.Open();saLayer.EditTools.BeginTransaction();saLayer.EditTools.Union("08846", targetSA);saLayer.EditTools.Delete("08812");saLayer.EditTools.CommitTransaction();saLayer.Close(); `   Here is my full source code. Would you please let me know what is that I need to modify to make it work? Please let me know to (shwe.ko@cegedim.com) if you need shape file.   ` using System;using System.Collections.Specialized;using System.Collections.Generic;using System.Collections.ObjectModel;using System.Collections;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using System.IO;using ThinkGeo.MapSuite.Core;using ThinkGeo.MapSuite.WebEdition;namespace NJTerritory2{    public partial class WebForm17 : System.Web.UI.Page    {        Dictionary g_SalesAreaZips = new Dictionary();        protected void Page_Load(object sender, EventArgs e)        {            if (!IsPostBack)            {                Map1.MapUnit = GeographyUnit.DecimalDegree;                Map1.MapBackground.BackgroundBrush = new GeoSolidBrush(GeoColor.GeographicColors.ShallowOcean);                Map1.MapTools.MouseCoordinate.Enabled = true;                ShapeFileFeatureSource.BuildIndexFile(@"C:\temp\WebSites\ThinkGeo\Data\NJ\tl_2010_34_zcta510.shp", @"C:\temp\WebSites\ThinkGeo\Data\NJ\tl_2010_34_zcta510.idx", "ZCTA5CE10", "\\w", BuildIndexMode.DoNotRebuild);                FillSalesAreas();                //===============================                ShapeFileFeatureLayer stateLayer = new ShapeFileFeatureLayer(@"C:\temp\WebSites\ThinkGeo\Data\NJ\tl_2010_34_zcta510.shp", @"C:\temp\WebSites\ThinkGeo\Data\NJ\tl_2010_34_zcta510.idx");                stateLayer.Name = "StateLayer";                stateLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.Park1;                stateLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;//20 is zoomest                //stateLayer.ZoomLevelSet.ZoomLevel01.DefaultTextStyle = TextStyles.CreateSimpleTextStyle("ZCTA5CE10", "Arial", 8, DrawingFontStyles.Italic, GeoColor.StandardColors.Black, 3, 3);                Map1.StaticOverlay.Layers.Add(stateLayer);                //=================================                LayerOverlay saOverlay = new LayerOverlay();                saOverlay.Name = "SAOverlay";                                foreach (string saName in g_SalesAreaZips.Keys)                    CreateSalesAreaLayer(saOverlay, saName);                saOverlay.IsBaseOverlay = false;                Map1.CustomOverlays.Add(saOverlay);                foreach (string saName in g_SalesAreaZips.Keys)                    MergeThem(saName);                //================================                Map1.CurrentExtent = GetFullExtent(stateLayer);            }        }        private void CreateSalesAreaLayer(LayerOverlay saOverlay, string saName)        {            if (g_SalesAreaZips.ContainsKey(saName))            {                InMemoryFeatureLayer saZipsLayer = new InMemoryFeatureLayer();                saZipsLayer.Name = saName;                //saZipsLayer.Open();                //saZipsLayer.Columns.Add(new FeatureSourceColumn("ZCTA5CE10"));                //saZipsLayer.Close();                saZipsLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.CreateSimpleAreaStyle(GeoColor.FromArgb(150, GeoColor.StandardColors.Brown), GeoColor.FromArgb(150, GeoColor.StandardColors.Aqua));                saZipsLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;                //saZipsLayer.ZoomLevelSet.ZoomLevel01.DefaultTextStyle = TextStyles.CreateSimpleTextStyle("ZCTA5CE10", "Arial", 8, DrawingFontStyles.Italic, GeoColor.StandardColors.Black, 3, 3);                //==================                BaseShape areaShape1 = new RectangleShape(-75, 40, -74.75, 39.75);                areaShape1.Id = "AreaShape1";                BaseShape areaShape2 = new RectangleShape(-74.85, 39.85, -74.5, 39.6);                areaShape2.Id = "AreaShape2";                saZipsLayer.InternalFeatures.Add("AreaShape1", new Feature(areaShape1));                saZipsLayer.InternalFeatures.Add("AreaShape2", new Feature(areaShape2));                //==================                Collection columnNames = new Collection();                columnNames.Add("ZCTA5CE10");                LayerOverlay stateOverlay = (LayerOverlay)Map1.StaticOverlay;//stateOverlay                ShapeFileFeatureLayer stateLayer = (ShapeFileFeatureLayer)stateOverlay.Layers[0];                stateLayer.Open();                Collection features = stateLayer.FeatureSource.GetAllFeatures(columnNames);                stateLayer.Close();                ArrayList zips = g_SalesAreaZips[saName];                foreach (string zip in zips)                {                    foreach (Feature f in features)                    {                        if (f.ColumnValues["ZCTA5CE10"] != zip) continue;                        if (!saZipsLayer.InternalFeatures.Contains(f))                            saZipsLayer.InternalFeatures.Add(zip, f);                    }                }                saOverlay.Layers.Add(saName, saZipsLayer);            }        }        private void MergeThem(string saName)        {            InMemoryFeatureLayer saLayer = null;            LayerOverlay saOverlay = (LayerOverlay)Map1.CustomOverlays[0];//SAOverlay                        try            {                saLayer = (InMemoryFeatureLayer)saOverlay.Layers[saName];            }            catch (Exception ex)            {                //does nothing            }            AreaBaseShape targetShape = (AreaBaseShape)saLayer.InternalFeatures["AreaShape1"].GetShape();            saLayer.Open();            saLayer.EditTools.BeginTransaction();            saLayer.EditTools.Union("AreaShape2", targetShape);            saLayer.EditTools.Delete("AreaShape1");            saLayer.EditTools.CommitTransaction();            saLayer.Close();                        //---------------            AreaBaseShape targetSA = (AreaBaseShape)saLayer.InternalFeatures["08812"].GetShape();            saLayer.Open();            saLayer.EditTools.BeginTransaction();            saLayer.EditTools.Union("08846", targetSA);            saLayer.EditTools.Delete("08812");            saLayer.EditTools.CommitTransaction();            saLayer.Close();                        saOverlay.Redraw();        }        private void FillSalesAreas()        {            ArrayList zips = new ArrayList();            zips.Add("08812");            zips.Add("08846");            g_SalesAreaZips.Add("SALESAREA1", zips);        }        private RectangleShape GetFullExtent(Layer layer)        {            Collection rectangleShapes = new Collection();            layer.Open();            if (layer.HasBoundingBox == true)                rectangleShapes.Add(layer.GetBoundingBox());            return ExtentHelper.GetBoundingBoxOfItems(rectangleShapes);        }    }}` 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**Author:** ![shwe](https://community.thinkgeo.com/letter_avatar_proxy/v4/letter/s/ed8c4c/32.png) [@shwe](https://community.thinkgeo.com/u/shwe)\ **Post date:** [January 2, 2012, 2:23pm UTC](https://community.thinkgeo.com/t/union-two-features/6082/2 "2012-01-02T14:23:19Z")
Please comment out below lines from the provided source code to see how does it look like before merging.   `foreach (string saName in g_SalesAreaZips.Keys)   MergeThem(saName); ` thank you shwe ---
**Author:** ![Ethan](https://community.thinkgeo.com/user_avatar/community.thinkgeo.com/ethan/32/19964_2.png) [@Ethan](https://community.thinkgeo.com/u/Ethan)\ **Post date:** [January 4, 2012, 2:11pm UTC](https://community.thinkgeo.com/t/union-two-features/6082/3 "2012-01-04T14:11:00Z")
Hi Shwe,      Thanks for your post.      I am looking at your question.      Regards,      Don ---
**Author:** ![Ethan](https://community.thinkgeo.com/user_avatar/community.thinkgeo.com/ethan/32/19964_2.png) [@Ethan](https://community.thinkgeo.com/u/Ethan)\ **Post date:** [January 9, 2012, 12:03pm UTC](https://community.thinkgeo.com/t/union-two-features/6082/4 "2012-01-09T12:03:00Z")
Hi Shwe,       I sent email to your mailbox but get looks fail.      Could you sent your shape file to [support@thinkgeo.com](mailto:support@thinkgeo.com) and ask him forward to me?      Regards,      Don