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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Questions And Answers

What is jQuery?

jQuery is not a programming language but a well written JavaScript code. It is a JavaScript code, which do document traversing, event handling, Ajax interactions and Animations.

Why jQuery is needed?

jQuery is needed for the following list:

·          Used to develop browser compatible web applications

·          Improve the performance of an application

·          Very fast and extensible

·          UI related functions are written in minimal lines of codes

Whether jQuery HTML work for both HTML and XML documents?

No, jQuery HTML only works for HTML documents not for XML Documents.

What are the methods used to provide effects?

Some of the effects methods are:

·          Show()

·          Hide()

·          Toggle()

·          FadeIn() and

·          FadeOut()

What is the advantage of using minimized version of jQuery?

Efficiency of web page increases when minimized version of jQuery is used.min.js file will be more than 50% less than the normal js file. Reduction in the file size makes the web page faster.

Is jQuery is a JavaScript or JSON library file?

jQuery is a library of JavaScript file and it consists of DOM, event effects and the Ajax functions. jQuery is said to be a single JavaScript file.

Which operating system is more compatible with jQuery?

Mac, Windows and Linux are more compatible with the jQuery.

How can we include jQuery library in ASP.Net project?

Download the jQuery library from jQuery.com and include that reference in the asp.net page.

Which command will give a version of jQuery?

The command $.ui.version returns jQuery UI version.

In what scenarios jQuery can be used?

jQuery can be used in following scenarios:

·          Apply CSS static or dynamic

·          Calling functions on events

·          Manipulation purpose

·          Mainly for Animation effects

What is the difference between find and children methods?

Find method is used to find all levels down the DOM tree but children find single level down the DOM tree.

What is jQuery connect?

A ‘ jQuery connect’  is a plugin used to connect or bind a function with another  function. Connect is used to execute function from any other function or plugin is executed.

How to use connect?

Connect can be used by downloading jQuery connect file from jQuery.com and then include that file in the HTML file. Use $.connect function to connect a function to another function.

What are the features of jQuery, has been used in web applications?

jQuery uses features like Sliding, File uploading and accordian in web applications.

What are the browser related issues for jQuery?

Browser compatibility of jQuery plugin is an issue and needs lot of time to fix it.

Whether we need to add jQuery file in both Master and Content page?

jQuery file should be added to the Master page and can use access from the content page directly without having any reference to it.

What are the basic selectors in jQuery?

Following are the basic selectors in jQuery:

·          Element ID

·          CSS Name

·          Tag Name

·          DOM hierarchy

Can we call C# code behind using jQuery?

Yes, we can call C# code from jQuery as it supports .net application.

What is the use jQuery.data method?

jQuery.data methods is used to associate the data with the DOM nodes and the objects. This data method makes the jQuery code clear and concise.

What is the use of each function in jQuery?

Each function is used to iterate each and every element of an object. It is used to loop DOM elements, arrays and the object properties.

What is the difference between size and length of jQuery?

Size and length both returns the number of element in an object. But length is faster than the size because length is a property and size is a method.

Can we add more than one ‘document.ready’ function in a page?

Yes, we can add more than one document.ready function in a page. But, body.onload can be added once in a page.

What is the use of jQuery load method?

jQuery load method is a powerful AJAX method which is used to load the data from a server and assign the data into the element without loading the page.

Whether our own specific characters are used in place of $ in jQuery?

Yes, We can use our own variable in place of $ by suing the method called no Conflict () method.

var sample = $.noConflict()

What are the four parameters used for jQuery Ajax method?

The four parameters are

·          URL – Need to specify the URL to send the request

·          type – Specifies type of request(Get or Post)

·          data – Specifies data to be sent to server

·          Cache – Whether the browser should cache the requested page

What is the use of jQuery filter?

The jQuery filter is used to filter the certain values from the object list based on the criteria. Example is to filter certain products from the master list of products in a cart website.

Which program is useful for testing jQuery?

QUnit is used to test jQuery and it is very easy and efficient.

What is CDN?

CDN is abbreviated as Content Distribution network and it is said to be a group of companies in different location with network containing copies of data files to maximize bandwidth in accessing the data.

What are the two types of CDNs?

There are two types of CDNs:

·          Microsoft – Load jQuery from Ajax CDN

·          Google – Load jQuery from Google libraries API

Which sign is used as a shortcut for jQuery?

Dollar ($) sign is used as a shortcut for jQuery.

Is jQuery is a client or server scripting?

jQuery is a client scripting.

What is the script build up by jQuery?

jQuery is a Javascript file and it is single javascript file that contains common DOM, event effects and Ajax functions.

How can we debug jQuery?

There are two ways to debug jQuery:

Debugger keyword

·          Add the debugger to the line from where we have to start debugging and then run Visual Studio in Debug mode with F5 function key.

·          Insert a break point after attaching the process

What are all the ways to include jQuery in a page?

Following are the ways to include jQuery in a page:

·          Local copy inside script tag

·          Remote copy of jQuery.com

·          Remote copy of Ajax API

·          Local copy of script manager control

·          Embedded script using client script object

What is the use of jQuery.ajax method ()?

jQuery.ajax method is used for asynchronous HTTP requests.

Where can we download JQuery?

jQuery javascript can be downloaded from jQuery official website – www.jquery.com

Is jQuery is a replacement of JavaScript?

No, jQuery is not a replacement of JavaScript.

What is called chaining?

Chaining is used to connect multiple events and functions in a selector.

What are the advantages of jQuery?

Following are the advantages of jQuery:

·          Just a JavaScript enhancement

·          Coding is simple, clear, reusable

·          Removal of writing more complex conditions and loops

Whether C# code behind can be called from jQuery?

Yes, we can call C# code behind from jQuery.

What is the use of jQuery.data() method?

jQuery data method is used to associate data with DOM nodes and JavaScript objects. This method will make a code very concise and neat.

What is the difference between onload() and document.ready()?

In a page, we can have only one onload function but we can have more than one document.ready function. Document.ready function is called when DOM is loaded but onload function is called when DOM and images are loaded on the page.

What is the use of jQuery each function?

jQuery each function is used to loop through each and every element of the target jQuery object. It is also useful for multi element DOM, looping arrays and object properties.

How method can be called inside code behind using jQuery?

$.ajax can be called and by declaring WebMethod inside code behind using jQuery.

Which is the fastest selector in jQuery?

ID and Element are the fastest selectors in jQuery.

What is the slowest selector in jQuery?

Class selectors are the slowest selectors in jQuery.

Where jQuery code is getting executed?

jQuery code is getting executed on a client browser.

What is the method used to define the specific character in place of $ sign?

‘NoConflict’ method is used to reference a jQuery and save it in a variable. That variable can be used instead of Sign.

Why jQuery is better than JavaScript?

jQuery is a library used for developing Ajax application and it helps to write the code clean and concise. It also handles events, animation and Ajax support applications.

What are the types of selectors in jQuery?

There are three types of selectors in jQuery:

·          CSS Selector

·          XPath Selector

·          Custom Selector

JSON

JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write. It is easy for machines to parse and generate. It is based on a subset of the JavaScript Programming Language.

JSON is a text format that is completely language independent but uses conventions that are familiar to programmers of the C-family of languages, including C, C++, C#, Java, JavaScript, Perl, Python, and many others. These properties make JSON an ideal data-interchange language.

JSON is built on two structures:
A collection of name/value pairs. In various languages, this is realized as an object, record, struct, dictionary, hash table, keyed list, or associative array.
An ordered list of values. In most languages, this is realized as an array, vector, list, or sequence.

Comparison between XML and JSON

JSON is smaller than XML, and faster and easier to parse.
XML is human-readable data interchange specified in a document format, while JSON is human-readable data interchange data format.
JSON is not extensible because it does not need to be. JSON is not a document markup language, so it is not necessary to define new tags or attributes to represent data in it.
JSON has the same interoperability potential as XML.
JSON is much simpler than XML. JSON has a much smaller grammar and maps more directly onto the data structures used in modern programming languages. 

useful

TTFB -- Time To First Byte 

Merge Datatable or DataSet

        con.Open();

        SqlDataAdapter adp = new SqlDataAdapter("select * from Reg", con);

        DataSet ds1 = new DataSet();

        adp.Fill(ds1);     

        adp = new SqlDataAdapter("select * from sale", con);

        DataSet ds2 = new DataSet();

        adp.Fill(ds2);      

        ds1.Merge(ds2,true);    

        if (ds1.Tables[0].Rows.Count > 0 && ds2.Tables[0].Rows.Count>0)

        {

            GridView1.DataSource = ds1;

            GridView1.DataBind();

        }

        con.Close();