Div dynamic loading is not supported in Windows IoT (yet?)

Hi. I built an side powered by SignalR recently. The function is easy that dynamically load from a URL provided from SignalR into a div from browser side. It works like a charm in IE, Edge and Chrome. The JavaScript written in the web page is simple:

  • SignalR 2.2.0 and jQuery 2.2.3 are selected;
  • Connect SignalR at beginning;
  • When SignalR disconnected, reconnect;
  • When SignalR event raised, call one method to pull the data from URL specified and set as content of a div; and,
  • Call the method mentioned above at beginning to load the initialization data.

Then, I need to do the same thing in one Raspberry Pi 3. I choose Windows IoT with UWP to build the basis. UWP app is quite easy, only one WebView control is embedded with the starting URL set to the page of that website. According to only Insider Preview version can support Raspberry Pi 3, build 14295 is selected, which is the latest one can be found from official site.

After this app deployed and started in Raspberry Pi 3, it acts quite different. The initialization data is shown without any problem. But no more SignalR event is proceeded. By debugging on the server side, SignalR OnConnected, OnDisconnected and OnReconnected are called repeatedly and frequently.

Due to no more information can be grabbed from app running in Raspberry Pi 3, I have no clue at first. The good thing is I made a similar solution before. The only difference between these 2 apps, is the previous one use iframe instead of div. Despite of no reason observed, after I change the div into iframe and make the data surrounded by html and body tags which filling div previously , the problem vanishes away.

UWP Developing: Don’t forget the firewall on IoT devices

After I deploy my UDP based application to Raspberry Pi 2 running Windows IoT 10.0.10586, this application receives nothing, just like running in a normal Windows computer.

I guess that maybe something related to firewall, but:
1 There is no article related to target that. As the time I’m writing this post, googling “Windows IoT firewall” returns nothing related.
2 There is no page for firewall configuration in Windows IoT utilities site.

Fortunately, a test proved that there is a built in Windows IoT.
By using PowerShell connection, I send the netsh command to create an exception of firewall. It accepted and the my application started to receive package after then.

Related command for reference:
netsh advfirewall firewall add rule name=”A name for this exception” dir=in action=allow protocol=UDP localport=12345

Hope this helps.

UWP Developing: Local network protocal stack issue

I’m working on developing a Universal Windows App (Windows 10 IoT) recently. My app includes a UDP server for receiving packages.

The issue I found is:
When the UWP running on local computer, the datagram sent by local console application cannot be received.

Normally, while developing a socket based network application, another application for making and sending test packages should be prepared. The problem is, for testing UWP application, either the tester should be prepared as UWP application, or this tester can only be used on another computer laying on the same network.

TFS 2015 Upgrading

There are 2 things you should have in mind about TFS 2015 Upgrading.

1 The database upgrading process will cost much more time than upgrading among Update package of TFS 2013.

2 The dedicated SharePoint integration package is removed and M$ did a shit test again. If you, like me, installed TFS on a server other than SharePoint cluster, now you have to install the whole TFS on all SharePoint servers. After the installation, the upgrading wizard will be popped up but it will failed due to no database can be found. You have to choose to install SharePoint integration role yourself. And after that, you will know that TFS SharePoint integration package 2013 will NOT and NOT ABLE to be removed, lol, just another piece of crap.

A way to run nearly all functions of dotNet from SQL Server

Last night, I got a case to write a function in SQL Server 2005 to support the user account and password check against Active Directory. The user requirement is quite clear:

  • Create a scalar-valued function named LDAPUserCheck;
  • Parameter @username nvarchar(MAX) for user name to check;
  • Parameter @password nvarchar(MAX) for password matching the username specified;
  • Return bit 1 if succeeded, or 0 for all other reasons.

After a digging, I found that LDAP password authentication is not supported directly by SQL Server. But SQLCLR is a way to build the native dotnet program into SQL Server. In a new created SQLCLR project in VS 2005, I realized it’s unable to add the reference System.DirectoryServices.AccountManagement, which is required by running the code for Active Directory authentication. But a Web Service is a choice.

My steps to achieve that:

1 Create and deploy a Web Service for the authentication check.

1.1 Create a Web Service project.

1.2 Add System.DirectoryServices.AccountManagement as a reference.

1.3 Add a setting DomainName as string for storing the domain name.

1.4 Add a service like this:

    public class LDAPAuthentication : System.Web.Services.WebService
        static string domainName = Settings.Default.DomainName;

        public bool Check(string userName, string password)
            using (PrincipalContext pc = new PrincipalContext(ContextType.Domain, domainName))
                // validate the credentials
                bool isValid = pc.ValidateCredentials(userName, password);
                return isValid;

1.5 Deploy this service and use a application pool running by a domain user. This user should be added to IIS_WPG group in Windows Server 2003.

2 Create a SQLCLR project to call the Web Service.

2.1 Create a SQLCLR project in Visual Studio 2005.

2.2 Add a Web Service reference. It’s named as LDAP in my project.

2.3 Add a User Defined Functions.

    public static SqlBoolean LDAPUserCheck(
        SqlString username, SqlString password)
        using (LDAPAuthentication.LDAP.LDAPAuthentication service = new LDAPAuthentication.LDAP.LDAPAuthentication())
            if (service.Check(username.ToString(), password.ToString()))
                return SqlBoolean.True;
                return SqlBoolean.False;

2.4 Set Permission Level to External in Database page of project setting.

2.5 Build this project to get the dll files. In my case, these files are named LDAPAuthentication.dll and LDAPAuthentication.XmlSerializers.dll.

3 Deploy this project into SQL Server 2005.

3.1 Enable the CLR support in SQL Server 2005 by running this code:

sp_configure 'show advanced options', 1;

sp_configure 'clr enabled', 1;

sp_configure 'show advanced options', 0;

3.2 Create a database for storing this function. Or, you can use any existed database as well. In my case, I created a database “tester”.

3.3 Set trustworthy on this database by running:

ALTER DATABASE [tester] SET trustworthy ON

3.4 Copy the 2 dll files created in step 2 to this server. In my case, these are stored in C:\SQLCLR folder.

3.5 Create assemblies in SQL Server by running:

create assembly [LDAPAuthentication] from 'C:\SQLCLR\LDAPAuthentication.dll' with permission_set = external_access
create assembly [LDAPAuthentication.XmlSerializers] from 'C:\SQLCLR\LDAPAuthentication.XmlSerializers.dll' with permission_set = external_access

3.6 Create function to run the method we’ve created in VS 2005:

CREATE FUNCTION [dbo].[LDAPUserCheck](@username [nvarchar](4000), @password [nvarchar](4000))
EXTERNAL NAME [LDAPAuthentication].[UserDefinedFunctions].[LDAPUserCheck]

Now everything is done. You can call this function like all others created by SQL. Run this for test.

select dbo.LDAPUserCheck('myusername','mypassword')


Solved: Why Linq Where.FirstOrDefault is faster than use FirstOrDefault with condition on an array?

Hi all.


Why applying “.Where(condition).FirstOrDefault()” is much faster than “.FirstOrDefault(condition) when it’s applied on an array?



Answer: While calling method Where() on an Array or a List, it’s optimized to use the enumerator of the source directly. But FirstOrDefault(), which doesn’t have this mechanism, runs the virtual method version from IEnumerator.GetEnumerator().

Special thanks to Iris Sakura.

Official feedback about removing orphan collection in TFS 2013

Continued from: Remove orphan collection item without related database in TFS 2013 with Update 2


It’s announced that this will be fixed in Update 3 of TFS by Microsoft Officially.


A workaround, editing database directly, is provided also.

But you should keep in mind that editing database directly is dangerous and will lose all supports from Microsoft.

Remove orphan collection item without related database in TFS 2013 with Update 2

Last week, the Configuration Manager in our company tested to create a collection in Team Foundation Server (TFS for short) 2013 with Update 2. After test, the database of this collection is deleted directly from SqlServer by mistake and there is no backup for it. So an orphan item for this collection is still existed there and have to be removed manually.


First, I try to remove it from Team Foundation Server Administration Console (TfsMgmt.exe). It failed in detach process.

Then, I try to do it with TFSconfig.exe in console mode. I’m pretty sure that’s work in previous version of TFS, maybe 2012. But in 2013 with Update 2, it failed the same as TfsMgmt.

I tried to use a database from another collection by renaming it as the deleted one, or even use a database created with another TFS instance with the same collection name, all failed.

At that time, I turned to MSDN forum. One MVP provided some tables within Tfs_Configuration database. Some deleting operations should be taken there. After that, the collection is removed from the TfsMgmt but it still can be found in Visual Studio at client side.

Finally, I detached all collections and redeployed the whole TFS instance. That works as predictable.


If somebody falls into the same jam, the detachment and redeployment is the only way to correct it, unless you have the backup of that deleted database.



Visual Studio 2013 Update 1 is not compatible with Windows 8.1 with Update (MSDN CD) while using sysprep

While the new installation CD named Windows 8.1 with Update launched for MSDN subscriptions user, I downloaded it and try to upgrade all the images from the Windows Deployment Service in my company. But I found the new version of Windows 8.1 might have some problem with Visual Studio 2013 Update 1.


Coz I need to upgrade some related images in batch, this is my way:

Create a VM and install Windows 8.1 (x64 enterprise version with update, downloaded from MSDN subscriptions site);

  1. Install Office 2013 with Service Pack 1 (VL version, coz there is a KMS in our company);
  2. Update to the latest patches;
  3. Run Cleanmgr to minimal the system;
  4. Create a snapshot named Office 2013;
  5. Use Sysprep to boot into the audit mode;
  6. Remove the current user;
  7. Use Sysprep to boot into the OOBE mode with Generalize checked;
  8. Use WDS to capture this status and upload, named as Office 2013. Before capturing, I deleted the pagefile, swap file and the contents within temp folder.

It works great.


  1. Reverse to snapshot Office 2013;
  2. Install Visual Studio 2013 with Blend, Office Developer Tools, SQL Server Data Tools, Web Developer Tools, Silverlight Development Kit; (No C++, nor mobile things)
  3. Install Update 1 from iso;
  4. Install Visual Studio SDK;
  5. Update to the latest patches;
  6. Run Cleanmgr to minimal the system;
  7. Create a snapshot named Visual Studio;
  8. Use Sysprep to boot into the audit mode;
  9. Remove the current user;
  10. Use Sysprep to boot into the OOBE mode with Generalize checked;
  11. Use WDS to capture this status and upload, named as Visual Studio. Before capturing, I deleted the pagefile, swap file and the contents within temp folder.

It looks familiar right? Actually, it WON’T WORK.

After deploy from this Visual Studio and create a new user, system end with this text:

The User Profile Service service failed the sign-in.

User profile cannot be loaded.

Even when trying to boot from the template VM in current status, it failed in the same way.

But if I try to install Team Explorer from Team Foundation Server with Update 2 CD instead, or using the Office 2013 image created above, it works like a charm. Even just use the old Windows 8.1 CD instead of the new one, it still works great.

I’ve check by using reg in command line. There is nothing wrong like this KB mentioned:

I have no clue about this but just leave a message here for avoiding others go into the same jam.



Update: It fixed in VS 2013 with Update 2.