10+ Dot Net Developer Trainee Interview Questions and Answers

Join is used to combine rows from two or more tables based on a related column between them.

• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

• INNER JOIN returns rows when there is at least one match in both tables.

• LEFT JOIN returns all rows from the left table and the matched rows from the right table.

• RIGHT JOIN returns all rows from the right table and the matched rows from the left table.

• FULL JOIN returns rows when there is a match in one of the tables...read more

Functions return a single value while stored procedures can return multiple values. Functions can be called from SQL statements while stored procedures cannot.

• Functions return a single value while stored procedures can return multiple values

• Functions can be called from SQL statements while stored procedures cannot

• Functions cannot modify the database state while stored procedures can

• Functions are used for computations and return values, while stored procedures are used for exe...read more

Interface is a blueprint for a class, while abstract class can have some implementation.

• Interface cannot have any implementation, only method signatures.

• A class can implement multiple interfaces but can inherit only one abstract class.

• Abstract class can have abstract and non-abstract methods, while interface can only have abstract methods.

• Interfaces are used to achieve multiple inheritance in C#, while abstract classes are used to provide a common base for derived classes.

MVC is a software architectural pattern for implementing user interfaces, Partial View is a reusable view component, Routing is mapping URLs to controller actions, Html helpers are methods to generate HTML elements, Stored Procedures are precompiled SQL queries.

• MVC is Model-View-Controller pattern for separating concerns in web applications

• Partial View is a reusable component in MVC for rendering a portion of a view

• Routing maps URLs to controller actions in MVC framework

• Html ...read more

ASP.NET page life cycle is the series of events that occur from the time a page is requested to the time the page is fully rendered and sent to the client browser.

• Page request is received by the server

• Page is initialized, controls are created and their properties are set

• Page is loaded with data and controls are rendered

• Page is unloaded and disposed

Method overloading is having multiple methods in the same class with the same name but different parameters. Method overriding is redefining a method in a subclass with the same name and parameters as in the superclass.

• Method overloading allows a class to have multiple methods with the same name but different parameters.

• Method overriding involves redefining a method in a subclass that is already defined in the superclass.

• Overloading is resolved at compile-time while overridin...read more

Yes, I have used WebApi in multiple projects to create RESTful APIs for web applications.

• Used WebApi to build RESTful APIs for communication between client and server

• Implemented CRUD operations using WebApi endpoints

• Secured WebApi endpoints with authentication and authorization mechanisms

• Utilized WebApi to integrate third-party services and data sources

Joins in SQL are used to combine rows from two or more tables based on a related column between them.

• Joins are used to retrieve data from multiple tables based on a related column.

• Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

• INNER JOIN returns rows when there is at least one match in both tables.

• LEFT JOIN returns all rows from the left table and the matched rows from the right table.

• RIGHT JOIN returns all rows from the right table and the mat...read more

OOPs concepts refer to Object-Oriented Programming principles like Inheritance, Encapsulation, Polymorphism, and Abstraction.

• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation details and showing only the necessary features.

A stored procedure is a precompiled collection of SQL statements that can be executed by calling the procedure name.

• Stored procedures can improve performance by reducing network traffic and increasing security.

• They can be used to encapsulate business logic and promote code reusability.

• Stored procedures are stored in the database and can be called from various applications or scripts.

• Example: CREATE PROCEDURE GetEmployeeDetails AS SELECT * FROM Employees WHERE Department = 'IT...read more

Web.config file is a configuration file used in ASP.NET applications to store settings and configurations.

• Contains settings for the ASP.NET application

• Can include connection strings, authentication settings, and custom error pages

• Located in the root directory of the ASP.NET application

• Can be used to specify custom error pages, session state settings, and more

A dangling pointer is a pointer that points to a memory location that has been deallocated, leading to undefined behavior.

• Dangling pointers can occur when a pointer is not set to NULL after the memory it points to is freed.

• Accessing a dangling pointer can result in a crash or unexpected behavior.

• Example: int *ptr = new int; delete ptr; // ptr is now a dangling pointer

A class is a blueprint for creating objects, and objects are instances of classes. Constructors are special methods used to initialize objects.

• Class is a template that defines the properties and behaviors of objects.

• Object is an instance of a class that has its own state and behavior.

• Constructors are special methods used to initialize objects when they are created.

• Example: Class 'Car' defines properties like 'color' and behaviors like 'drive'. Object 'myCar' is an instance of...read more

An interface in programming defines a contract for classes to implement, specifying methods and properties that must be included.

• Interfaces in C# are similar to abstract classes but can only contain method signatures, properties, events, and indexers.

• Classes can implement multiple interfaces, allowing for flexibility in defining behavior.

• Interfaces are used to achieve polymorphism and decouple code, making it easier to maintain and extend.

• Example: public interface IShape { vo...read more

ASP.NET is a web application framework developed by Microsoft for building dynamic web sites, web applications, and web services.

• Developed by Microsoft

• Used for building dynamic web sites, web applications, and web services

• Supports multiple programming languages like C# and VB.NET

• Uses server-side scripting to generate dynamic web pages