Top 50+ ASP.NET Asked Question in Interview
- Rapid Development: ASP .NET provides a robust set of tools and libraries that facilitate rapid development. Features like server controls, data binding, and reusable components help developers build applications quickly and efficiently.
- Scalability: ASP .NET applications are highly scalable, allowing them to handle a large number of users and requests without compromising performance. The framework supports load balancing, caching, and session state management, making it suitable for high-traffic websites.
- Security: Security is a top priority in ASP .NET. The framework offers built-in security features such as authentication, authorization, and data encryption to protect applications from common security threats. Developers can also implement additional security measures to ensure robust protection.
- Cross-platform Compatibility: ASP .NET Core, the latest version of ASP .NET, is cross-platform and can run on Windows, macOS, and Linux. This flexibility allows developers to build applications that can be deployed on various operating systems without major modifications.
- Integration with Visual Studio: ASP .NET integrates seamlessly with Visual Studio, Microsoft's powerful IDE. This integration streamlines the development process, providing features like code debugging, IntelliSense, and project management tools that enhance productivity and code quality.
- Support for Multiple Languages: ASP .NET supports multiple programming languages, including C#, Visual Basic, and F#. Developers can choose the language they are most comfortable with, making it easier to collaborate on projects and leverage existing skills.
- Community Support: ASP .NET has a large and active community of developers, forums, and resources. This community support ensures that developers can find solutions to problems, share knowledge, and stay updated on the latest trends and best practices in web development.
- Application_Start: This event occurs when the application is started for the first time. It is triggered before the first request is processed.
- Application_BeginRequest: This event is raised at the beginning of each request. It is the first event that is fired for a particular request.
- Application_AuthenticateRequest: This event is raised when the security module has established the identity of the user.
- Application_AuthorizeRequest: This event is raised when the security module has verified that the user is authorized to access the requested resource.
- Application_EndRequest: This event is raised at the end of each request. It is the last event that is fired for a particular request.
- Application_End: This event occurs when the application is shutting down. It is the last event that is fired before the application domain is unloaded.
- Project Structure: Solution Explorer displays the hierarchical structure of your solution, including projects, folders, files, and references. This visual representation helps developers organize and navigate through the various elements of their project efficiently.
- File Management: Developers can add, remove, rename, and organize files directly from the Solution Explorer. This feature streamlines the process of managing project assets and ensures that all files are easily accessible within the solution.
- Resource Access: Solution Explorer provides quick access to project resources such as images, scripts, stylesheets, and configuration files. By simply expanding the relevant nodes, developers can locate and modify these resources without leaving the IDE.
- Build and Debug: Developers can initiate builds, run/debug applications, and manage project configurations directly from Solution Explorer. This integration simplifies the build and debugging process, allowing for seamless development workflows.
- Search and Filter: Solution Explorer offers search and filtering capabilities, enabling developers to quickly locate specific files or components within a large solution. This feature enhances productivity by reducing the time spent searching for items manually.
- Source Control Integration: Solution Explorer seamlessly integrates with version control systems like Git, TFS, or SVN. Developers can perform source control operations such as commit, push, pull, and branch management directly from the Solution Explorer interface.
Global.asax is a vital file in ASP.NET applications that serves as the global application class. It acts as a central hub for handling application-level events and customizing application behavior. Let's delve into the various uses of Global.asax:
1- Application Events Handling: Global.asax allows developers to respond to application-level events such as Application_Start, Application_End, Session_Start, Session_End, etc. These events enable developers to execute custom logic when the application starts, ends, or when a session begins or ends.
2- Application Configuration: Developers can use Global.asax to configure application settings, register routes, set up authentication, define error handling strategies, and perform other application-wide configurations.
3- Global Error Handling: By implementing the Application_Error event in Global.asax, developers can centrally manage and log unhandled exceptions that occur during application execution.
4- Session Management: Global.asax plays a crucial role in managing user sessions by providing events like Session_Start and Session_End to perform actions when a user session begins or ends.
5- Application Lifecycle Management: It helps in controlling the application lifecycle by defining custom logic for various stages like application start, end, session start, session end, etc.
6- Dependency Injection and IoC Container Setup: Developers can use Global.asax to set up dependency injection containers or IoC containers to manage object dependencies throughout the application.
7- Custom Application Initialization: Global.asax allows developers to execute custom initialization logic before the application starts serving requests, enabling tasks like database connections, cache setup, etc.
- Culture: Represents the user's language, region, and other preferences. In ASP.NET, cultures are represented by CultureInfo objects.
- Resource Files: Storing strings, messages, and other content in resource files allows for easy translation and adaptation to different languages.
- Date and Time Formats: Using DateTime and CultureInfo to display dates and times in a format that aligns with the user's culture.
- Number Formats: Formatting numbers, currencies, and percentages based on the user's culture using NumberFormatInfo.
- Resource Files: Creating separate resource files for each language to store translated content.
- Explicit Localization: Using tools like ResourceManager and ResourceProviderFactory to retrieve localized content based on the user's culture.
- UI Localization: Translating user interface elements such as labels, buttons, and messages to match the user's language and culture.
- URL Localization: Implementing URL routing and language-specific URLs to direct users to localized content.
- Consistent Layout: Master pages enable you to define the layout once and apply it to multiple content pages.
- Centralized Design: Changes made to the master page reflect on all associated content pages, ensuring consistency.
- Nested Master Pages: You can create a hierarchy of master pages to manage different sections of your application.
- Content Placeholders: Master pages contain content placeholders where specific content for each page can be inserted.
- Shared Resources: CSS, JavaScript, and other resources can be shared across all pages using master pages.
Data binding uses a special syntax
- Server.Transfer is a server-side method that transfers control directly to another page on the server without the client's knowledge.
- It preserves the original URL in the browser, meaning the client is unaware of the redirection happening on the server.
- The transfer is faster than Response.Redirect as it avoids the round trip to the client.
- It can only transfer control to an internal page within the same application.
- It is suitable for scenarios where you want to transfer control between pages without changing the URL visible to the client.
- Response.Redirect is a client-side redirect method that sends a response to the client's browser to navigate to a different page.
- It issues an HTTP 302 response to the client, instructing the browser to make a new request to the specified URL.
- It changes the URL in the browser, and the client can see the new URL in the address bar.
- It is slower than Server.Transfer as it involves a round trip to the client.
- It can redirect to pages outside the current application or even to external websites.
- Server.Transfer: Client is unaware of the redirection.
- Response.Redirect: Client sees the new URL in the address bar.
- Server.Transfer: Faster as it avoids a round trip to the client.
- Response.Redirect: Slower due to the round trip to the client.
- Server.Transfer: Can only transfer to internal pages within the same application.
- Response.Redirect: Can redirect to any page, internal or external.
<asp:Login>
: Provides a standard login capability that allows the users to enter their credentials<asp:LoginName>
: Allows you to display the name of the logged-in user<asp:LoginStatus>
: Displays whether the user is authenticated or not<asp:LoginView>
: Provides various login views depending on the selected template<asp:PasswordRecovery>
: email the users their lost password
Web services have file extension .asmx..
- Server-side validations are performed on the server after the data is submitted by the client.
- These validations are essential for security and data integrity as they cannot be bypassed by the client.
- They involve checking data against business rules, database constraints, and other server-side logic.
- Commonly implemented in the backend code using languages like C#, Java, or Python in the case of Asp.net applications.
- Client-side validations are performed on the client's browser using JavaScript before the data is submitted to the server.
- They provide instant feedback to users without the need to submit the form, enhancing user experience.
- These validations are more about improving user interaction and reducing server load rather than strict security.
- They are easier to implement but should always be accompanied by server-side validations for robust data validation.