Class and object in c# with real time example

In this tutorial, I am going to discuss about the "real-time example of Class and object in c#". To understand object and class concepts read this post carefully.

What is OOPS..?
Object-oriented programming (OOP) is a programming structure where programs are managed by objects, classes and it ’s action and logic. C# provides full support for 
object-oriented programming including encapsulation, inheritance, and polymorphism.

Class and object in c# with real time example

Class and object in c# with real time example

If we talking about the class in any language, a class is just a user define data type used to represent the relation between the data and functions or methods.

A class can have many things like variable, function, properties. In another way, we can say that class is a block of code where we can define the state and behavior of objects, function, and variables.

Note: By default class is internal.

See below Syntax Format:

Class class name



Here I am taking an example of c# class.

using System;   //namespace

class Employee
    public string name;
    int age;
    string address;

    public string departmant()           //method define by me
      return "I.T.";
    static void Main(string[] args)      //Main method

      Employee emp = new Employee();   //Object creation of Employee class = "Jhon";
      emp.age = 10;
      emp.address = "Delhi";
      Console.WriteLine(" "+emp.age+" "+emp.address+" "+emp.departmant());

In the above example, we can see that our method and variable are exits in class.

Object: An object is basically an instance of the class. It allocated the memory to access the member of the class. An object is a real-time entity.
 If we want to access the class member we need to create an object of that particular class.
In the below example, we take ‘Employee’ as a class then ‘emp’ are the object.

Syntex for Object:

ClassName objectname=new ClassName();


Employee emp = new Employee();   //Object creation of Employee class
In the above syntax, the ‘new’ operator is used to create an object of a class. When we create an object, then the system creates the memory for data members and methods that are present in the class.

Important Point to remember 
An object is the base type of all classes in the dot net framework. This object can hold any kind of value, however, boxing will be done implicity and unboxing need type casting mechanism.

Also Read: 
                 Boxing and Unboxing With Simple Example
                 Lockdown SQL Course

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How to pass query string in hyperlink in asp net

Pass query string in hyperlink in asp net

Today, I am going to show with you "how we can pass query string in the hyperlink". So let's get started step by step tutorial of passing query string in the hyperlink. Many times a situation arrives when we need to pass query string from one page another page by hyperlink. If you want to use hyperlink with query string, also this tutorial will helpful for you.

How to pass query string in hyperlink in asp net, multiple query string in gridview

Step to implement the query string with hyperlink

1. Add an server-side hyperlink control.
2. Put the value and key in herf attributes.
3. URL of the page on which you want to redirect.

Use Single Query in hyperlink

  <asp:TemplateField HeaderText="View">
         <asp:HyperLink ID="HyperLink1" ForeColor="red" Text="view" Target="_blank"
       runat="server" NavigateUrl='<%#"StudentView.aspx?id="+Eval("StudentID").ToString()%>'></asp:HyperLink>

How to use multiple query string in hyperlink in in grid view

    <asp:TemplateField HeaderText="View">
            <asp:HyperLink runat="server" NavigateUrl='<%# string.Format("~/Details.aspx?StudentID={0}&StudentName={1}", (Eval("Empsalary").ToString()),
    (Eval("Empsalary").ToString())) %>' Text="View" Target="_blank"/>

If you have any issue, please drop a comment below. We will happy to help you.
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How to execute function in sql with parameters - Solved

Execute function in SQL with parameters: In this tutorial, I am going to show with you how you can execute the function of SQL with parameter. We will also talk about the single parameter as well as multiple parameters. 

execute function in sql with multiple parameters


Make a SQL Function with parameter
2. Call it With select keyword

Let's See step by step process to execute SQL function with parameters. In the below function, I have a create a function which will find the date of birth. You can make any function but the function calling process will be the same.

Execute function in SQL with Single parameters

Create function age
@dob date
     declare @age int
     set @age=DATEDIFF(YEAR,@dob,GETDATE())-
         when (month(@dob) > month(GETDATE())) or
               (month(@dob) = month(GETDATE()) and day(@dob) > day(GETDATE()))
         THEN 1
         ELSE 0
     RETURN @age

select dbo.age('01/02/2014')
select dbo.age('01/02/2014') as age

Execute function in SQL with Multiple parameters

In below function, I have a created function which is used to count record from a table, In this function, you will see the use of multiple parameters.

Calling of SQL function with multiple parameters

  select DBO.Login('Sana',123)

Create a table and Insert some Record then make a function. Definitely, You will be able to understand better.

CREATE TABLE [dbo].[Mytbl]
          [Name] [varchar](20) Primary Key Identity,
          [PhoneNo] [int] NULL,
          [Gender] [varchar](5) NULL,
          [Pass] [int] NULL,
          [Address] [varchar](20) NULL

INSERT [dbo].[Mytbl] ([Name], [PhoneNo], [Gender], [Pass], [Address]) VALUES ('Sana', 9125, 'F', 123, 'Noida')
INSERT [dbo].[Mytbl] ([Name], [PhoneNo], [Gender], [Pass], [Address]) VALUES ('Sana', 9125, 'F', 123, 'Noida')
INSERT [dbo].[Mytbl] ([Name], [PhoneNo], [Gender], [Pass], [Address]) VALUES ('Sanjay', 8989,'M', 0, 'Noida')
INSERT [dbo].[Mytbl] ([Name], [PhoneNo], [Gender], [Pass], [Address]) VALUES ('Manu', 8978, 'M', 0, 'Gzbd')
INSERT [dbo].[Mytbl] ([Name], [PhoneNo], [Gender], [Pass], [Address]) VALUES ('Ram', 8958, 'M', 78945, 'Mayur Vihar')
INSERT [dbo].[Mytbl] ([Name], [PhoneNo], [Gender], [Pass], [Address]) VALUES ('Sanjay Yadav', 121,'M', 0, 'noida')
INSERT [dbo].[Mytbl] ([Name], [PhoneNo], [Gender], [Pass], [Address]) VALUES ('Ramesh ', 343, 'M', 23, 'AshokNagar')
INSERT [dbo].[Mytbl] ([Name], [PhoneNo], [Gender], [Pass], [Address]) VALUES ('Ramesh ', 343, 'M', 23, 'AshokNagar')

Create a function with multiple parameters

Create function [dbo].[Login](@n varchar(20),@pwd int)
returns int
       declare @temp int
             select @temp=count(*) from Mytbl where Name=@n and Pass=@pwd
             return @temp

  select DBO.Login('Sana',123)

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23 Typescript interview questions and answers for beginners

Welcome to Typescript interview questions (pdf) and answers for beginners, Here are some tricky typescript interview question and answers collection which is asked in the interview. May it will help you to crack your typescript interview.

Typescript interview questions and answers for beginners
Typescript interview questions and answers

1. What is namespace in Typescript? Write the declaration of the namespace.

I think Everyone familiar with the namespace of other languages, here also in TypeScript a namespace is just a collection of classes by which we can logically categories. If we want to access any class from outside of the namespace then we need to export keyword.

namespace People
      export class Boss
      export class Employee
      export interface Iofficework


2. What is Typescript?

TypeScript is known as Object-oriented programming language developed and maintained by Microsoft. Which is provide you to optional parameters, classes, and interfaces.TypeScript is nothing but JavaScript and some additional features i.e. ES6 features. Whenever we compile the TypeScript code it first converts in JavaScript then it runs and we get output.

3.Difference between typescript and javascript?

1. Typescript is a superset of JavaScript whereas JavaScript is a scripting language.
2. Typescript has an interface concept but JavaScript havan't.
3.TypeScript doesn't run in the browser where JavaScript runs.
4.TypeScript has classes whereas JavaScript has functions.
5. Typescript support module whereas JavaScript doesn't support modules.
6. In typescript Number, a string is the interfaces whereas In, JavaScript Number, string are the Object.

4. What are the key features of typescript?

TypeScript supports different browsers or node.js versions and optimizes the resulting JavaScript. It is much easier to write clean, consistent code across a project and development team.

5.When to use a super keyword in typescript.

In typescript, Super keyword is used to reference base class properties and the base class constructor.

6.How to access static methods in TypeScript

7. What Are Classes In Typescript?

The concept of classes is very similar to .NET/Java. A Class can have constructor, member variables, properties, and methods. TypeScript also allows access to modifiers “private” and “public” for member variables and functions.

8. Tell me the command for installing typescript.

npm install -g typescript

9. What Are The Benefits Of Typescript?

TypeScript has the following benefits:

2Impose coding guidelines
3.Offers type checking
4. It helps in code structuring
5.Compile time error checking
6. Use class-based object-oriented programming

10. What is the typescript extension and how you compile?

Typescript extension is '.ts'. It is just a javascript file, when we compile typescript file, just after compilation it convert into '.js' file.

Step to compile a typescript program
1. tsc 'your typeScript File Name'
For example, to compile “program.ts”:
tsc program.ts

After compilation, you will get

11. How to declare a variable in Typescript?

var name:string="sham"
var phone:string="123456"

12. How do you declare an undefined variable?

var name:string;

var phone:int;

13. How to declare and initialize an array in Typescript?

var names:string[];       -- Declaration

names=["a","b","c","d"]   -- Initialization

14. How to achieve inheritance in Typescript?

15. How to make a module in Typescript?

16. What is the role of constructor in Typescript?

A constructor is responsible for initializing the variable of the class.

17. How to initialize the static variables?

class office
   static phoneNo:number=101;
   console.log(office.phoneNo) ;

18. What is the difference between var and let in Typescript?

1.var declaration done at function scoped and let declaration done at block scoped.
2.var allow you to re-declare the same variable in the same scope. whereas let will not

19.How to define a global variable in a typescript module.

20.How to export a variable.

export var demo = [1,2,3];

21. What is the role of var keyword in typescript?

var is key it helps us to create an object of a class.

22. How to Convert string to number in TypeScript?

   //convert string to number
   this.empcode = Number(name);

23. Can we debug Typescript file?

Yes, With the help of .js source map file.

24. What are the classes in TypeScript?

Typescript class is very similar to other languages like (.Net, Java). As we know that class can have constructor, member, variable and methods.

25. What are the benefits of Typescript?

1. ES7 and ES6 Features support.
2. User-friendly for Java and .Net programmer.
3. Intellisense.
4. Object Oriented programming support.

TAG: Typescript interview questions and answers for beginners, Typescript interview question and answers, beginner typescript question and answer

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