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Top 25 OOPs Interview Questions and Answers (2026 Edition)
In 2026, software interviews are no longer about memorizing syntax—they are about how well you think in terms of design, structure, and scalability. This is exactly why OOPs Interview Questions continue to dominate technical interviews for freshers across service-based and product-based companies. Whether you are preparing for your first campus placement or an entry-level developer role,…
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This blog covers the list of Top 50 R programming language interview questions and answers that frequently asked during the R interview.
programming interview questions
Programming Unit is a blog dedicated to Source codes, Interview Questions, Data structures, Algorithms, and Learning the Major concepts of Programming.
Get the complete guide of frequently asked Python and SQL Interview Questions with detailed answers and examples at Stratascratch.
Most asked Interview questions and their answers
Practice interview questions that are most probably asked in interview. Join the thousand of developers practicing mock interviews for free. Crack the coding interview and crush your dream job
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WPF Interview Questions:- Can you explain the overall architecture of WPF?
Figure: - Architecture of WPF
Above figure shows the overall architecture of WPF. It has three major sections presentation core, presentation framework and milcore. In the same diagram we have shown how other section like direct and operating system interact with the system. So let’s go section by section to understand how every section works.
User32 :- It decides which goes where on the screen.
DirectX : - As said previously WPF uses directX internally. DirectX talks with drivers and renders the content.
Milcore : - Mil stands for media integration library. This section is a unmanaged code because it acts like a bridge between WPF managed and DirectX / User32 unmanaged API.
Presentation core :- This is a low level API exposed by WPF providing features for 2D , 3D , geometry etc.
Presentation framework :- This section has high level features like application controls , layouts . Content etc which helps you to build up your application.
Below video explain what is WPF and how they differ from Windows form
Explain the difference between early binding and late binding? ( C# interview questions with answers)
Early binding or early bound means the target methods, properties and functions are detected and checked during compile time. If the method / function or property does not exist or has a data type issues then the compiler throws an exception during compile time.
Late binding is opposite of early binding. Methods, properties and functions are detected during runtime rather than compile time. So if the method, function or property does not exist during runtime application will throw an exception.
In simple words everything is early binded until you are using reflection or dynamic keyword.
When should we use “x:name” vs “name” ? (C# WPF interview questions)
There is no difference between “x:name” and “name” , “name” is short hand of “x:name”. But in classes where you do not find “name” property ( this is a rare situations) we need to use “x:name” property.
Below video explain what is WPF and how they differ from Windows form
