What's the benefits of using MVVM over MVC?

The MVVM pattern provides two-way communication between the pattern parts, whereas MVC is able only to provide one-way communication. The main advantage relates to using an additional layer of non-visual parts on the Model top. It helps a developer to map data closer to the View parts.........

MVC is suitable for web apps where you can write the entire application in C# to work on a browser.  Since in MVC View is smart and knows about the model and works on the properties of the model, can even call methods of the model (using Razor) it is lot more convenient to use.

However in MVVM, Views don't have access to the real model and has only access to a special ViewModel which contains only data that can be used for UI, and is designed so that one can have different views for the same ViewModel, for example, a mobile app designed using Xamarin that can run on Andrioid, iOS, Windows Phone.

Both have their usages.  Essentially they are the same concept with slightly different flavor.  In MVVM, you dumb down model even further, so that it carries only presentation level data that can be displayed on any device and one can collect data from any device.

difference between the Class and Interface
A Class has both definition and an implementation whereas Interface only has a definition.

A Class can be instantiated but an Interface cannot be instantiated You can create an instance of an Object that implements the Interface.

A Class is a full body entity with members, methods along with there definition and implementation. An Interface is just a set of definition that you must implement in your Class inheriting that Interface.

How to run Visual Studio as administrator always

Step 1 : Goto to executable of Visual studio IDE in “C:\Program Files(x86)\Microsoft Visual Studio 9.0\Common7\IDE\”, Right click on devenv.exe -> Properties -> Compatibility-> And Select “Run as Administrator” check box.

You will also need to setup for visual studio launcher.

Step 2: Go to executable of Visual Studio Launcher on “C:\Program Files (x86)\Common Files\microsoft shared\MSEnv\VsLauncher.exe” and follow same steps like step 1.

SqlSmash

SqlSmash Now Works With Microsoft Azure SQL Databases
 we rolled out support for Microsoft Azure Sql Databases in SqlSmash. When connected to Azure SQL, all the features should work exactly like they do with local Sql Server Databases.
A lot of companies are embracing the cloud going forward, and we want to support those of you using Microsoft’s Azure SQL platform.

Multiple Browser Option -- Select Browser

As a web developer, for performing cross browser testing, we need to run our web site in multiple browser from Visual Studio. Generally, in a common way, we select particular browser from browser selection menu and run the application.  However, you can set multiple browser as your default browser. When you run the application with out debugging ( Ctrl+ F5) , Visual Studio will run the application in all the browser, in case of debugging (F5),  Visual Studio will prompt you to select particular browser from the selected default browser list. You can link this feature very much with Refreshing browsers directly from Visual Studio 2013, where you can refresh the browser directly from Visual Studio.
In the browser list drop-down, by default you will be able to see all the list of added browser, with default browser as checked.
 Browse With
 Select Browser Menu Options
When you select the “Browse With…” option, following dialog will appear, and you can see all the list of browser along with the browser which marked as “(Default)”.
Default Selected Browser
Fig: Browse With Dialog Control
Now, there can be more than one default browser, and same has been written in the dialog control as well – “Browsers (Select one or more):” . So, select all the browser in which you want run the application together, and click on “Set as Default”.  That’s all. Now if you click on “Browse” button in the same dialog control, you will find your web application starts on all the selected browser same time.
Multiple Default Browser
 Select multiple browser as default browser
If you back to Visual Studio main menu, a new option “Multiple Browser” will appear.
Multiple Browser Option
Fig: Multiple browser option
Now, if you want to debug the application, and press “F5” or select the multiple browsers options, following dialog will appear, and you need to select a specific browser from the list of selected browsers.
Multiple Browser Option - Select Browser
 Select Browser from the list of default browser
If you run the application without debugging mode and wanted to run the application to verify the cross browser compatibility, Visual Studio will invoke all the browser for the same application.
This feature is really useful for web developer and who spends time on for cross browser testing ! and of courser – all the web developer spends time for the same !! So, from next time, apply this feature!
Note: This is note new features with Visual Studio 2013, it was available in previous version as well.
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