IValidatableObject and IDataErrorInfo

At the beginning it was IDataErrorInfo. Next , it came IValidatableObject. And , because some GUI frameworks implement one and not other, I must think to a common way to validate once .

My choice was to validate with IValidatableObject and IDataErrorInfo just re-send data.

I made an example with a class User which has UserName, UserEmail and UserPassword.

Without much ado, this is the code:

 public class User : IValidatableObject, IDataErrorInfo
        public string UserEmail { get; set; }
        public string UserName { get; set; }
        public string UserPassword { get; set; }

        public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
            if (string.IsNullOrEmpty(UserEmail))
                yield return new ValidationResult("UserName", new string[1] { "UserName" });

            if (string.IsNullOrEmpty(UserEmail))
                yield return new ValidationResult("UserEmail", new string[1] { "UserEmail" });

            if (string.IsNullOrEmpty(UserEmail))
                yield return new ValidationResult("UserPassword", new string[1] { "UserPassword" });


        //IDataErrorInfo - you can copy this code to each class
        public string Error
            get { return this[""]; }

        public string this[string columnName]
                string ret = null;
                var data = this.Validate(new ValidationContext(this, null, null));
                switch (columnName)
                    case "":

                        foreach (var item in data)
                            ret += item.ErrorMessage + Environment.NewLine;
                        foreach (var item in data)
                            if (item.MemberNames.Contains(columnName))
                                ret += item.ErrorMessage + Environment.NewLine;
                return ret;

And you can verify like this:

User u = new User();
            Console.WriteLine("-----from  IDataErrorInfo");
            string err = (u as IDataErrorInfo)[""];
            Console.WriteLine("-----from  IvalidatableObject");
            foreach(var item in (u as IValidatableObject).Validate(new ValidationContext(u, null, null)))

            Console.WriteLine("-----from  Validator");
                Validator.ValidateObject(u, new ValidationContext(u, null, null), true);
            catch (ValidationException EX)

                Console.WriteLine("JUST " + EX.Message);

You can find the code also there


I am working at a new application ( Azure + MVC + logging) and I am having a good time  – when I know resources. This are the steps that works for me:

  1. Azure SDK ( it would be good if you have Sql Server). Now version 1.6, download from http://www.microsoft.com/download/en/details.aspx?id=28045
      1. Optional : run DSInit , http://msdn.microsoft.com/en-us/library/windowsazure/gg433005.aspx , to modify default SqlServer instance
  2. Windows Azure ASP.NET Providers Sample – good to fast use membership in Azure.
      1. for local , the .config keys are

        <add key="AccountName" value="devstoreaccount1" />
            <add key="AccountSharedKey" value=""></add>
            <add key="BlobStorageEndpoint" value="" />
            <add key="TableStorageEndpoint" value="" />

      2. for azure, the .config keys are

           <add key="AccountName" value="…………………………" />
          <add key="AccountSharedKey" value="………………"></add>

          <add key="BlobStorageEndpoint" value="https://logcollectorazure.blob.core.windows.net" />
          <add key="TableStorageEndpoint" value="https://logcollectorazure.table.core.windows.net" />

  3. Add Table Storage Provider- either from samples, either from here  http://blogs.msdn.com/b/jnak/archive/2010/01/06/walkthrough-windows-azure-table-storage-nov-2009-and-later.aspx  ( read http://blogs.msdn.com/b/jnak/archive/2008/10/28/walkthrough-simple-table-storage.aspx too)
      1. for local , the .config keys are
      2. <add key="BlobStorageEndpoint" value="" />
        <add key="TableStorageEndpoint" value="" />

      3. for azure, the .config keys are

<add key="BlobStorageEndpoint" value="https://logcollectorazure.blob.core.windows.net" />
<add key="TableStorageEndpoint" value="https://logcollectorazure.table.core.windows.net" />

From now, you do have

a) An Membership Provider -  to create users

b) Azure Tables that can be searched with IQueryable .

This is all you need for now. Later you will enquire about caching / session / application. I would post them when I will be programming more. However , for caching I will be starting at http://code.msdn.microsoft.com/windowsazure/Using-AppFabric-Cache-595454bb and for session at http://code.msdn.microsoft.com/windowsazure/Using-AppFabric-Cache-595454bb



I have the opportunity to borrow a Kinect hardware  – to make an application( I will make a simple anti-theft application).

The steps for developing in Kinect are:

  • Download the SDK from http://www.microsoft.com/en-us/kinectforwindows/develop/overview.aspx – it contains the drivers also
  • Connect Kinect to USB , plug in the socket
  • Run the Kinect Explorer or Kinect Shape Game from Kinect SDK Sample Browser installed at 1.  Ensure it works.
  • Read the Kinect Explorer source –it is SO clear!
  • Read documentation – finally, you should RTFM Winking smile

Optional resources:

  1. http://kinectcontrib.codeplex.com/ – Visual Studio template for Skeleton, Audio, Video. Simple example that works ( simpler than Kinect Explorer !)
  2. http://c4fkinect.codeplex.com/ – added methods to Kinect.
  3. http://kinecttoolbox.codeplex.com/ – detection of gesture.

Example 1: Integrating saving image in Kinect Explorer when a skeleton is detected

Add reference to optional resource 2( either download , either via Nuget)

Search for  KinectAllFramesReady in KinectSkeletonViewer.xaml.cs and put this code

						var takePic = this.skeletonData.Count(item => item.TrackingState == SkeletonTrackingState.Tracked) > 0;

						if (takePic)
							DateTime imgDate = DateTime.Now;
							string imageName = "andrei" + imgDate.ToString("yyyyMMdd_HHmmss") + ".jpg";
							if (!File.Exists(imageName))
								using (var image = e.OpenColorImageFrame())
									if (image != null && this.skeletonData.Length > 0 && this.skeletonData.Count(item => item.TrackingState != SkeletonTrackingState.NotTracked) > 0)
										if (image != null && takePic)
											var x = image.ToBitmapSource();
											var b = Save(x, ImageFormat.Jpeg);

											var t = Task.Factory.StartNew(

												(img) =>

													imgDate = DateTime.Now;
													imageName = "andrei" + imgDate.ToString("yyyyMMdd_HHmmss") + ".jpg";
													if (File.Exists(imageName))
													byte[] i = img as byte[];
													if (i != null)
														File.WriteAllBytes(imageName, i);
												}, b);

Example 2 : Detecting circle by right hand in Kinect Explorer when a skeleton is detected

Add reference to optional resource 3( either download , either via Nuget)

Download circleKB.save file and put in your project. Ensure “Copy to output directory” is “copy always/copy if newer”

Add a variable named

TemplatedGestureDetector circleGestureRecognizer;

In KinectSkeletonViewer.xaml.cs in constructor put

			using (Stream recordStream = File.Open("circleKB.save", FileMode.Open))
				circleGestureRecognizer = new TemplatedGestureDetector("Circle", recordStream);
				circleGestureRecognizer.OnGestureDetected += new Action<string>(circleGestureRecognizer_OnGestureDetected);
//TODO : implement circleGestureRecognizer_OnGestureDetected : void circleGestureRecognizer_OnGestureDetected(string obj)

Search for KinectAllFramesReady in KinectSkeletonViewer.xaml.cs and put this code

foreach (Joint joint in skeleton.Joints)//existing code
								Point mappedPoint = this.GetPosition2DLocation(depthImageFrame, joint.Position);//existing code
								jointMapping[joint.JointType] = new JointMapping//existing code
										Joint = joint,
										MappedPoint = mappedPoint
//new code from here:
									 if ((joint.TrackingState == JointTrackingState.Tracked) && (joint.JointType == JointType.HandRight))
											circleGestureRecognizer.Add(joint.Position, Kinect);


That will be all…
If you have developed with Kinect, please share your sources as comments.

Attach macro

A visual studio macro to attach to a program to your choice:

Public Sub AttachPRogram()
            Dim dbg2 As EnvDTE80.Debugger2 = DTE.Debugger
            Dim trans As EnvDTE80.Transport = dbg2.Transports.Item("Default")
            Dim compName As String = System.Net.Dns.GetHostName()
            Dim procAll = dbg2.GetProcesses(trans, compName)
            For Each proc2 As Process2 In procAll
                If (proc2.Name.ToLower().Contains("your program name here")) Then


                End If
            Next proc2

        Catch ex As System.Exception
        End Try
    End Sub

friday links 18

MVC 4 beta was the release of the month : http://www.asp.net/mvc/mvc4 

  1. NETFx3 Samples – Home – dynamic calling WCF services
  2. Alan Turing’s reading list (with readable links) | John Graham-Cumming
  3. Six Whys – Or, Never Trust Your Network Switch – Blog – Stack Exchange
  4. In a New Era for Marketing, Parental Discretion Advised – Leslie Gaines-Ross – Harvard Business Review
  5. Dynamic Proxy and Memory Footprint – Vipul Modi’s Blog – Site Home – MSDN Blogs
  6. A look at ASP.NET MVC 4 | Techdays 2012 the Netherlands | Channel 9
  7. How to: Create Custom Configuration Sections Using ConfigurationSection
  8. RESTful Services with ASP.NET MVC and XHTML
  9. ASP.NET MVC Localization: Generate resource files and localized views using custom templates | Rui Jarimba
  10. ASP.NET: Downloading files from a UNC share | Rui Jarimba
  11. Single Page Application Overview: The Official Microsoft ASP.NET Site
  12. XML Visualizer v.2 – CodeProject®
  13. Calling a WCF service from a client without having the contract interface – CodeProject®
  14. 52 Things People Should Know To Do Cryptography
  15. Must-have Tools on Windows – Part 1 of 2 – Punit Ganshani
  16. Download HelpNDoc Personal Edition | HelpNDoc
  17. HelpNDoc’s feature tour | HelpNDoc
  18. Recruiting: 8 Qualities Your Best Employees Should Have | Inc.com
  19. Ubuntu for Android Effort Takes Flight – InternetNews.
  20. Mark Shuttleworth » Blog Archive » Ubuntu in your pocket
  21. Simple Talk Newsletter
  22. Automated Script-generation with Powershell and SMO
  23. How to Kill a Company in One Step or Save it in Three

Andrei Ignat weekly software news(mostly .NET)

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