Top 100 ASP.NET Core Interview Questions and Answers for 2024 PART - 1
An Overview of ASP.NET Interview Questions as well as Responses
ASP.NET is an open-source web framework that uses .Net to create quick and safe web applications and services. The main feature of ASP.NET is that it is a cross-platform framework, which means that you can create ASP.NET web applications with HTML, CSS, Javascript, or JQuery and it can operate on any operating system. ASP.NET Interview Questions and Answers can be found in this tutorial. With the use of ASP.NET training and ASP.NET interview questions and answers, you may create web applications that can be used with any other third-party resources, such as Google, Facebook, or Microsoft.
1.) Whats the difference between a .NET and C#?
- .NET:
- Comprehensive
framework developed by Microsoft.
- Used
for building and running applications on Windows, macOS, and Linux.
- Provides
libraries, tools, and runtime environments.
- Supports
multiple programming languages.
- C#:
- Programming
language designed for the .NET framework.
- Object-oriented
and modern.
- Offers
simplicity, readability, and scalability.
- Used
for building various types of applications within the .NET ecosystem.
2.) Differentiate between .NET Framework vs .NET Core vs
.NET 5.0:
- .NET Framework:
- Developed by
Microsoft.
- Initially released
in 2002.
- Designed primarily
for Windows-based applications.
- Has a large set of
libraries and APIs.
- Supports ASP.NET
Web Forms, MVC, and Windows Forms.
- .NET Core:
- Also developed by
Microsoft.
- First released in
2016.
- Cross-platform
framework, supporting Windows, macOS, and Linux.
- Lightweight and
modular.
- Designed for
modern application development, including cloud-based and microservices
architectures.
- Supports ASP.NET
Core for web development and cross-platform console applications.
- .NET 5.0:
- Represents the
convergence of .NET Framework and .NET Core.
- Released in 2020.
- Unified platform
for building all types of applications, including web, desktop, mobile, cloud,
and IoT.
- Continues the
cross-platform support introduced in .NET Core.
- Introduces new
features and improvements over previous versions, including performance
enhancements and language updates.
3.) Difference between managed and unmanaged code:
- Managed Code:
- Code that is
executed by the Common Language Runtime (CLR) in the .NET framework.
- Provides automatic
memory management, garbage collection, and runtime environment services.
- Written in
high-level languages like C#, VB.NET, or F#.
- Managed code runs
within a managed environment, ensuring safety and security through features
like type-safety and memory management.
- Unmanaged Code:
- Code that is
executed directly by the operating system without the assistance of a runtime
environment like the CLR.
- Typically written
in low-level languages like C or C++.
- Developers are
responsible for manual memory management, resource allocation, and
deallocation.
- Unmanaged code can
directly interact with system resources and hardware, offering more control but
also requiring careful handling to avoid memory leaks and security
vulnerabilities.
4.) What is IL code?
- IL (Intermediate Language) code is the intermediate
representation of .NET code generated by the compiler from source code written
in languages like C#, VB.NET, or F#.
- It is a platform-independent, CPU-neutral set of
instructions that can be executed by the Common Language Runtime (CLR) on any
system that supports the .NET framework.
5.) Why IL code is not fully compiled?
- IL code is not fully compiled into machine code because it
needs to be executed in a managed environment by the CLR.
- This allows for platform independence and runtime optimizations
based on the target system's architecture and capabilities.
6.) Who compiles the IL code and how does it work?
- The CLR compiles IL code into native machine code at
runtime through a process called Just-In-Time (JIT) compilation.
- This ensures that the code is optimized for the specific
hardware and operating system on which it is running.
7.) How does JIT compilation work?
- JIT compilation occurs dynamically at runtime when a
method is called for the first time.
- The CLR analyzes the IL code and generates native machine
code tailored to the current execution environment.
- This native code is then executed directly by the CPU,
improving performance compared to interpreting IL code.
8.) What are the different types of JIT?
- There are three types of JIT compilation:
1. Normal JIT:
Compiles methods when they are called at runtime.
2. Econo JIT:
Optimizes compilation time and memory usage by deferring compilation until
necessary.
3. Pre-JIT:
Compiles all methods into native code at installation time or startup,
producing an executable or assembly with pre-compiled code.
9.) What is Native Image Generator (Ngen.exe)?
- Ngen.exe is a tool provided by the .NET framework that
pre-compiles IL code into native machine code ahead of time.
- It generates native images, which can improve startup
performance by reducing the need for JIT compilation at runtime.
10.) So does it mean that NGEN.EXE will always improve
performance?
- While Ngen.exe can improve startup performance by reducing
JIT compilation overhead, its impact on overall performance may vary depending
on factors such as the application's usage patterns and the target system's
configuration.
- It may not always lead to performance improvements in all
scenarios.