Category Archives: C#

Bootstrap 3 Datepicker (eonasdan) does not work with jQuery 3.0 or above

if you are developing MVC, and you might have chance to look for a DateTimePicker for your MVC project. One of the favorites DateTimePicker is “Bootstrap 3 DatePicker” developed by Eonasdan ( ). You may download and get it from Nuget. You may also install by using Bower, Rails, Angular, Meteor or manually. The latest version in Nuget is v4.15.35.1.


One of the dependency is the jQuery. I have installed the latest one jQuery v3.1.1 at the moment I am writing to this blog.

I have followed the sample code Eonasdan has provided but I could not make it working. After some searching, I found out that Eonasdan has developed it when jQuery was still in v2. And jQuery has some changes from v2 to v3. One of the changes is jQuery does not provide the object.count() for jQuery object. It is changed into object.length

So, now you could make some code changes to the bootstrap-datetimepicker.js and the DatePicker will be working again. There are 2 locations of code that you have to change. Just simply search for “count()” and replace it as “length”.

Hope that my blog will help you to fix it. And as I know, someone has also point this out to the GitHub and commit into a new branch. But Eonasdan has not yet merge it into the release branch. Let’s do this fix in our way before he release the fixed code so that we could get a corrected js from Nuget.


Set menu item to Active in MVC with BootStrap

Recent I start working on MVC with BootStrap for building the great Web UI. I am building a menu with several menu items and found out that it is not setting as “active” in the class of the item when a page is loaded.


By default the MVC template doesn’t add the active class to the “li” item in the menu. So I have to add the class=”active” to the “li” to indicate the active menu item.


Above is the code that is used for the actual menu that create the menu in the first screenshot. if you look at line 8, you will see the class=”active”, this is what makes the active menu item. In order for us to do this, we need to know what page is currently loaded and then apply the active class css to the corresponding “li” element. The best way to do this, is to create a HTML helper to handle this for us.

Now, let’s try to create a new folder in the project and called “Helpers”. Then add a new class named “HtmlHelpers.cs” (from my sample, I used KenLinHtmlHelpers). here we could create an extension method of the HtmlHelpers method. We do this by creating a static class.


As you can see, I have created 2 method, IsActive and IsActiveController. The only difference is, do you want to take Action into one of the input parameter. If you want to set class is active whenever it is in the specific controller, you could use IsActiveController. Otherwise, you may use IsActive if you want the active class only in exactly the specified Action and Controller. Please also note that, I am letting the activeClass and inActiveClass input as optional with a default value.

Now we could update our cshtml as below,


Look carefully on each “li” item now. There is a new HtmlHelper method to check and show if it is the active controller.  Please also look carefully, I have also called the method in line 9, for the parents of the dropdown Menu.

NOTE: You have to reference the class in the top of the view page that you are using the IsActive or IsActiveController method in. Just add the code as line 1 of the above screenshot.

NuGet redirection and package retrieval errors in Visual Studio 2015

Yesterday I have experience that I tried to install NuGet Package but an error occurred while retrieving package metadata in Visual Studio 2015.


After getting some try and catch. I found out that the VS2015 is configured to connect the API v3 of the So I tried to add another one with the URL on API v2 of the and I am then able to install any NuGet package. So I think that if you hit into the same error, this is a good to try.




Useful links to learn Windows 10 and VS2015

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I am sure that you all are new to Win10 and VS2015. You may be looking for learning resource. Here I listed some of the sample site for you and so you could get some learning on these 2 new products.

Opportunity URLs Remarks
Developer Tools Download Download any Visual Studio skus, including VS 2015
Developer for Windows 10  -What’s New
Get Started
All the info developers may need to write apps
Windows 10 courses in MVA Great site to get online courses on Windows 10
Channel Another great online resource for Windows 10 related videos
Windows 10 Jumpstart A live event on August 14th

Visual Studio 2015 is released

As many of you might know that VS2015 is already released on 20th July 2015. If you are MSDN Subscriptor, you could download and install it now. For the Team Foundation Server 2015, you might have to wait for a little bit longer.

Watch the keynote on demand below to learn about the latest features and technologies. You can also watch the Visual Studio developer team create an end-to-end solution for an open-source project and see how they tackled problems along the way.

For more Visual Studio 2015 deep dive videos, please visit

To download Visual Studio 2015, please visit

For more information about Visual Studio 2015, please visit