Net Interview questions

This morning a colleague of mine asked me for a list of questions to prepare for a .Net technical interview. I thought it would be useful to share this list with everyone.
A) Developer

1) OO

• Explain principles of Object Orientation?
• Can you use abstract classes in place of Inheritance ? What are the differences between these two concepts?
• Explain polymorphism and write an example in code (C#).

2) Patterns

• What are Patterns?
• List some patterns you’ve already used.
• Explicit one pattern by writing a small example.
• Explain following patterns: Repository, Factory, Root Aggregate.

3) UML

• What are the most useful UML diagrams? (list & explain at least 5) .

4) Net & C#

• What is .Net? (Managed Code - CLR - Runtime) ?
• Explain concepts as JIT, CLR, GAC, GC?
• Explain series of processing steps an ASP.NET page goes through (= page lifecycle of ASP.NET) ?
• Explain following c# keywords: Static, ReadOnly, Const?
• What is: a Webservice,WCF, WPF, Silverlight and how do these technologies/concepts relate to each other?

5) DB

• Write simple query that joins 2 tables via a 1-to-N relation that contains a filter and a group by clause.
• Explain what is a Transaction.
• What are the properties of a transaction (-> ACID)
• Explain concepts as Primary Key & Clustered Index and how these concepts relates?
• Is a GUID a good Clustered index, explain why?

Read more: Geoffrey Vandiest

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