using System;  
 using System.Collections.Generic;  
 using System.Linq;  
 using System.Windows.Forms;  
 
 namespace Dissolve  
 {  
     static class Program  
     {  
         /// <summary>  
         /// The main entry point for the application.  
         /// </summary>  
         [STAThread]  
         static void Main()  
         {  
             Application.EnableVisualStyles();  
             Application.SetCompatibleTextRenderingDefault(false);  
             Application.Run(new TestForm());  
         }  
     }  
 }  
 

 using System;  
 using System.Collections.Generic;  
 using System.Collections.ObjectModel;  
 using System.Data;  
 using System.Drawing;  
 using System.IO;  
 using System.Windows.Forms;  
 using ThinkGeo.MapSuite.Core;  
 
 namespace Dissolve  
 {  
     public partial class TestForm : Form  
     {  
         private MapEngine mapEngine = new MapEngine();  
         private Bitmap bitmap = null;  
 
         public TestForm()  
         {  
             InitializeComponent();  
         }  
 
         private void TestForm_Load(object sender, EventArgs e)  
         {  
             // Set the full extent and the background color  
             mapEngine.CurrentExtent = ExtentHelper.GetDrawingExtent(new RectangleShape(-128,52,-63,20), Map.Width, Map.Height);  
             mapEngine.BackgroundFillBrush = new GeoSolidBrush(GeoColor.GeographicColors.ShallowOcean);  
 
             // Add the states shapefile to the MapEngine  
             LoadStateShapeFile();  
 
             DrawImage();  
         }  
 
         private void btnDissolve_Click(object sender, EventArgs e)  
         {  
                 //deletes the files for the dissolved shapefile if they already exist.  
                 if (File.Exists(@"..\..\Data\USregions.shp"))  
                 {  
                     DeleteDissolveFiles();  
                 }  
 
                 //Creates the dissolved shapefile to the mapEngine.  
                 ShapeFileFeatureLayer dissolveLayer = DissolveShapeFile((ShapeFileFeatureLayer)mapEngine.StaticLayers[0], "sub_region", @"..\..\Data\USRegions.shp");  
 
                 //Adds the dissolved shapefile to the mapEngine.  
                 mapEngine.StaticLayers.Clear();  
                 ShapeFileFeatureLayer.BuildIndexFile(@"..\..\Data\USRegions.shp", BuildIndexMode.DoNotRebuild);  
                 dissolveLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.County1;  
                 dissolveLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;  
                 mapEngine.StaticLayers.Add("USregionLayer", dissolveLayer);  
                 DrawImage();  
                 btnDissolve.Enabled = false;  
         }  
 
       private ShapeFileFeatureLayer DissolveShapeFile(ShapeFileFeatureLayer shapeFileFeatureLayer, string column, string DissolvedShapeFilePath)  
         {  
             shapeFileFeatureLayer.Open();  
             //Gets all the distinct values for the column the dissolve is going to be based on.  
             DataTable tempDataTable = shapeFileFeatureLayer.FeatureSource.ExecuteQuery("Select distinct " + column + " from " + Path.GetFileName(shapeFileFeatureLayer.ShapePathFileName));  
 
             //Creates the dissolve shapefile with the collum the dissolve is going to be based on.  
             DbfColumn NameColumn = new DbfColumn(column, DbfColumnType.String, 30, 0);  
             ShapeFileFeatureSource.CreateShapeFile(shapeFileFeatureLayer.GetShapeFileType(), DissolvedShapeFilePath, new DbfColumn[] { NameColumn });  
             ShapeFileFeatureSource dissolveFeatureSource = new ShapeFileFeatureSource(DissolvedShapeFilePath, ShapeFileReadWriteMode.ReadWrite);  
             dissolveFeatureSource.Open();  
             dissolveFeatureSource.BeginTransaction();  
 
             foreach (DataRow dataRow in tempDataTable.Rows)  
             {  
                 Collection<AreaBaseShape> polygonShapes = new Collection<AreaBaseShape>();  
                 Collection<Feature> features = shapeFileFeatureLayer.FeatureSource.GetFeaturesByColumnValue(column, System.Convert.ToString(dataRow[0]));  
                 //Loops thru all the features with the same column value and add their shape to the polygonShapes collection.  
                 foreach (Feature feature in features)  
                 {  
                     AreaBaseShape polygonShape = (AreaBaseShape)feature.GetShape();  
                     polygonShapes.Add(polygonShape);  
                 }  
 
                 //Uses the PolygonShape.Union static method to union all the shapes in one step.  
                 MultipolygonShape multiPolygonShape = PolygonShape.Union(polygonShapes);  
                 //Adds the resulting feature from the dissolve operation to the dissolve shapefile.  
                 Dictionary<string, string> Columns = new Dictionary<string, string>();  
                 Columns.Add(column, System.Convert.ToString(dataRow[0]));  
                 Feature newFeature = new Feature(multiPolygonShape, Columns);  
                 dissolveFeatureSource.AddFeature(newFeature);  
             }  
             //Commits and closes the open resources.  
             dissolveFeatureSource.CommitTransaction();  
             dissolveFeatureSource.Close();  
             shapeFileFeatureLayer.Close();  
 
             //Creates the dissolved shapefile to return.  
             ShapeFileFeatureLayer dissolveShapeFile = new ShapeFileFeatureLayer(DissolvedShapeFilePath, ShapeFileReadWriteMode.ReadOnly);  
             return dissolveShapeFile;  
         }  
 
      private void DeleteDissolveFiles()  
       {  
           File.Delete(@"..\..\Data\USregions.shp");  
           File.Delete(@"..\..\Data\USregions.ids");  
           File.Delete(@"..\..\Data\USregions.idx");  
           File.Delete(@"..\..\Data\USregions.dbf");  
           File.Delete(@"..\..\Data\USregions.shx");  
       }  
 
       private void LoadStateShapeFile()  
       {  
           ShapeFileFeatureLayer stateLayer = new ShapeFileFeatureLayer(@"..\..\Data\States.shp", ShapeFileReadWriteMode.ReadOnly);  
           stateLayer.Name = "States";  
           ShapeFileFeatureLayer.BuildIndexFile(@"..\..\Data\States.shp", BuildIndexMode.DoNotRebuild);  
           stateLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.County1;  
           stateLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;  
           mapEngine.StaticLayers.Add("StateLayer", stateLayer);  
 
 
       }  
 
         private void DrawImage()  
         {  
             if (bitmap != null) { bitmap.Dispose(); }  
             bitmap = new Bitmap(Map.Width, Map.Height);  
             mapEngine.OpenAllLayers();  
             mapEngine.DrawStaticLayers(bitmap, GeographyUnit.DecimalDegree);  
             mapEngine.CloseAllLayers();  
             Map.Image = bitmap;  
         }  
 
         private void ToolBar_ButtonClick(object sender, ToolBarButtonClickEventArgs e)  
         {  
             switch (e.Button.Tag.ToString())  
             {  
                 case "Zoom In":  
                     mapEngine.CurrentExtent.ScaleDown(50);  
                     break;  
                 case "Zoom Out":  
                     mapEngine.CurrentExtent.ScaleUp(50);  
                     break;  
                 case "Full Extent":  
                     mapEngine.CurrentExtent = ExtentHelper.GetDrawingExtent(new RectangleShape(-180.0, 83.0, 180.0, -90.0), Map.Width, Map.Height);  
                     break;  
                 case "Pan Left":  
                     mapEngine.CurrentExtent = ExtentHelper.Pan(mapEngine.CurrentExtent, PanDirection.Left, 20);  
                     break;  
                 case "Pan Right":  
                     mapEngine.CurrentExtent = ExtentHelper.Pan(mapEngine.CurrentExtent, PanDirection.Right, 20);  
                     break;  
                 case "Pan Up":  
                     mapEngine.CurrentExtent = ExtentHelper.Pan(mapEngine.CurrentExtent, PanDirection.Up, 20);  
                     break;  
                 case "Pan Down":  
                     mapEngine.CurrentExtent = ExtentHelper.Pan(mapEngine.CurrentExtent, PanDirection.Down, 20);  
                     break;  
                 default:  
                     break;  
             }  
             DrawImage();  
         }  
 
         private void btnClose_Click(object sender, EventArgs e)  
         {  
             this.Close();  
         }  
 
 
     }  
 }