Hiring guide for ASP.NET Engineers

ASP.NET Developer Hiring Guide

ASP.NET is a server-side web application framework developed by Microsoft, first released in January 2002 with version 1.0 of the .NET Framework. It is designed for web development to produce dynamic web pages and applications. The language is built on the Common Language Runtime (CLR), allowing programmers to write ASP.NET code using any supported .NET language. ASP.NET's successor, ASP.NET Core, was released in 2016 as a significant redesign of ASP.NET. This information is sourced from Microsoft's official documentation and various historical records on software development.

Ask the right questions secure the right ASP.NET talent among an increasingly shrinking pool of talent.

First 20 minutes

General ASP.NET app knowledge and experience

The first 20 minutes of the interview should seek to understand the candidate's general background in ASP.NET application development, including their experience with various programming languages, databases, and their approach to designing scalable and maintainable systems.

What are the different types of cookies in ASP.NET?
There are two types of cookies in ASP.NET: Persistent Cookies and Session Cookies. Persistent Cookies are stored on the user's device and remain there even after the browser is closed. Session Cookies are temporary and are removed as soon as the user closes the browser.
How would you handle exceptions in ASP.NET?
In ASP.NET, exceptions can be handled using try-catch blocks, where the code that might throw an exception is placed in the try block and the exception is caught and handled in the catch block. Another way is to use the Global.asax file to handle exceptions at the application level.
What is ViewState in ASP.NET?
ViewState is a built-in structure for automatically retaining values between multiple requests for the same page. It is used to store user data on page at the time of post back of web page.
Describe the difference between Server.Transfer and Response.Redirect.
Server.Transfer transfers from one page to another without making a round-trip back to the client's browser. This provides a faster response with a little less overhead on the server. Response.Redirect is used to redirect the user's browser to another page or site. It performs trip in the client browser and redirects to a new page.
What is the role of the Global.asax file in ASP.NET?
The Global.asax file, also known as the ASP.NET application file, is used to handle application-level and session-level events. It is optional and can be used to handle events like Application_Start, Application_End, Session_Start, Session_End, etc.
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What you’re looking for early on

Does the candidate have a strong understanding of ASP.NET framework?
Has the candidate demonstrated problem-solving skills?
Is the candidate familiar with the latest trends and technologies in ASP.NET?
Can the candidate effectively communicate their thought process and solutions?

Next 20 minutes

Specific ASP.NET development questions

The next 20 minutes of the interview should focus on the candidate's expertise with specific backend frameworks, their understanding of RESTful APIs, and their experience in handling data storage and retrieval efficiently.

How would you implement caching in ASP.NET?
Caching in ASP.NET can be implemented using the Cache object, which lets you store data that can be globally accessed in your application. You can also use the @OutputCache directive to cache the output of a page or user control.
What are HttpHandlers and HttpModules in ASP.NET?
HttpHandlers and HttpModules are components that are used to process requests. An HttpHandler is the process that runs in response to a request made to an ASP.NET application. An HttpModule is an assembly that is called on every request that is made to your application.
Describe the difference between a DataReader and a DataSet in ASP.NET.
A DataReader is a forward-only, read-only cursor that is used to read data from a database. It is faster and uses less memory than a DataSet. A DataSet is an in-memory representation of a collection of Database objects that includes tables, relations, and constraints.
What is the use of Master Pages in ASP.NET?
Master Pages in ASP.NET provide a template for one or more web pages in your application. It allows you to create a consistent layout for the pages in your application.
How would you secure an ASP.NET application?
ASP.NET application can be secured by using Windows authentication, Forms authentication, or Passport authentication. It can also be secured by using authorization, where you can specify which resources a user is allowed to access.
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The ideal back-end app developer

What you’re looking to see on the ASP.NET engineer at this point.

At this point, a skilled ASP.NET engineer should demonstrate strong problem-solving abilities, proficiency in ASP.NET programming language, and knowledge of software development methodologies. Red flags include lack of hands-on experience, inability to articulate complex concepts, or unfamiliarity with standard coding practices.

Digging deeper

Code questions

These will help you see the candidate's real-world development capabilities with ASP.NET.

What does the following ASP.NET code do?
public ActionResult Index()
    return View();
This code defines an action method for the 'Index' view. When this action method is invoked, it returns the 'Index' view.
What will be the output of the following ASP.NET code?
string str = 'Hello';
string str2 = str;
str2 += ' World';
The output will be 'Hello'. This is because strings in .NET are immutable. When we append ' World' to str2, it creates a new string and str2 now points to this new string, but str still points to the original 'Hello' string.
What does the following ASP.NET code do?
List numbers = new List {1, 2, 3, 4, 5};
numbers.RemoveRange(1, 3);
This code creates a list of integers and then removes three elements starting from the second element. The resulting list will be {1, 5}.
What does the following ASP.NET code do?
public class Worker
    public void DoWork()
        for (int i = 0; i < 5; i++)

Thread workerThread = new Thread(new Worker().DoWork);
This code creates a new thread and starts it. The new thread executes the 'DoWork' method of the 'Worker' class, which prints 'Working...' to the console every second for 5 seconds.

Wrap-up questions

Final candidate for ASP.NET Developer role questions

The final few questions should evaluate the candidate's teamwork, communication, and problem-solving skills. Additionally, assess their knowledge of microservices architecture, serverless computing, and how they handle ASP.NET application deployments. Inquire about their experience in handling system failures and their approach to debugging and troubleshooting.

What are the different types of validation controls in ASP.NET?
ASP.NET provides several validation controls like RequiredFieldValidator, RangeValidator, CompareValidator, RegularExpressionValidator, CustomValidator, and ValidationSummary.
Describe the difference between a GridView control and a DataList control.
GridView control is used to display the values of a data source in a table where each column represents a field and each row represents a record. The DataList control is used to display data in any repeating structure, like a table.
What is a PostBack in ASP.NET?
PostBack is the process in which a webpage sends data back to the same page on the server.

ASP.NET application related

Product Perfect's ASP.NET development capabilities

Beyond hiring for your ASP.NET engineering team, you may be in the market for additional help. Product Perfect provides seasoned expertise in ASP.NET projects, and can engage in multiple capacities.