What C# Coding Problems Should Freshers Practice for .NET Developer Interviews?

Freshers should avoid preparing only theoretical C# questions. Interview preparation should include coding problems that demonstrate problem-solving, object-oriented programming, collections, LINQ, exception handling, asynchronous programming, and clean coding practices. A strong practice set should include problems such as string and array manipulation, duplicate detection, frequency counting, sorting and searching, palindrome checks, anagram detection, recursion, and dictionary-based problems. After mastering these, candidates should move toward practical C# scenarios involving LINQ, async/await, interfaces, dependency injection, generics, delegates, and exception handling. For example, an interviewer may ask a candidate to retrieve unique employees from a collection, group employees by department using LINQ, process multiple API calls asynchronously, or design a small service using interfaces and dependency injection. These problems test whether the candidate can apply C# concepts rather than simply define them. Recommended progression: C# fundamentals → Collections → OOP → LINQ → Exception Handling → Generics → async/await → Dependency Injection → Practical .NET scenarios. For working professionals, the next level should include writing testable, maintainable, performant code and explaining the trade-offs behind implementation decisions.