Parenting Win-form and WPF form in ArcMap

Parenting of Win-form windows and WPF windows within a ArcMap application using C#.Net code snippets-

Step 1: Create a ArcMapWrapper.cs, wrapper class

        using System;

        using System.Windows.Forms;

        using ESRI.ArcGIS.Framework;

        namespace ArcMapClassLibrary2

        {

               class ArcMapWrapper:IWin32Window

               {

                    private IApplication _arcMapApplication;

                    public ArcMapWrapper( IApplication mApplication)

                    {

                       _arcMapApplication = mApplication;

                    }

                    public IntPtr Handle

                    {

                       get { return new IntPtr(_arcMapApplication.hWnd); }

           

                     }

                 }

           }

Step 2: Access from Win-form

              WinForm fm = new WinForm();                        

              ArcMapWrapper wrapper= new ArcMapWrapper(map_application);  

              fm.ShowInTaskbar = false;        

              fm.Show(wrapper);

              //Try, it behaves like a modal dialog

              //fm.ShowDialog()

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Create standalone feature class and feature class inside feature dataset on Geodatabase using ArcObjects

 public void StartUp()   
    {   
     try   
     {   
       //create gdb   
      const string path = "D:/SampleDatasets/NewShp";   
      const string fileGDBName = "sample.gdb";   
      const string fileGDBAddress = path + "/" + fileGDBName;   
      const string featureDatasetname="polygonFeatureClasses";   
      const string featureClassname = "MytestPolygons";   
      if (System.IO.Directory.Exists(fileGDBAddress))   
      {   
       Console.WriteLine("already exist");   
       // return;   
      }   
      Type factoryType = Type.GetTypeFromProgID("esriDataSourcesGDB.FileGDBWorkspaceFactory");   
      IWorkspaceFactory workspaceFactory = (IWorkspaceFactory)Activator.CreateInstance(factoryType);   
      IWorkspaceName workspaceName = workspaceFactory.Create(path, fileGDBName, null,ArcMap.Application.hWnd);   
      MessageBox.Show("gbd created!");   
      

      //Create feature dataset   
      IFeatureWorkspace fws = workspaceFactory.OpenFromFile(fileGDBAddress, ArcMap.Application.hWnd) as IFeatureWorkspace;   
      

     //check the existance of FeatureDataset   
      IWorkspace2 ws = fws as IWorkspace2;   
      if(ws.get_NameExists(esriDatasetType.esriDTFeatureDataset,featureDatasetname)==true)   
      {   
       MessageBox.Show("Feature dataset is already exists");   
      }  

      #region feature Class inside feature Dataset : Region_1 (Choose either Region_1 or Region_2)  
     

      //Create a spatial refrence/extract spatial refrence from map   
      //Infuture will access through the arcmap   
      ISpatialReferenceFactory spatialReferenceFactory = new SpatialReferenceEnvironmentClass();   
      int coordinateSystemID = (int) esriSRGeoCSType.esriSRGeoCS_WGS1984;   
      ISpatialReference spatialReference =spatialReferenceFactory.CreateGeographicCoordinateSystem(coordinateSystemID);   
      

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