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8,174 net lead interview questions shared by candidates

What is boxing and unboxing? What are assemblies and namespaces? What is the difference between const, readonly, and static Difference between abstract class and interface? What is the use of async and await in C#? What is a delegate? How is it different from an event? What is LINQ? Can you show an example? Difference between IEnumerable, IQueryable, List? What is Dependency Injection in C#? What are extension methods? What are access modifiers in C#?
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Dot NET Developer

Interviewed at HCLTech

3.5★
Jun 5, 2025

What is boxing and unboxing? What are assemblies and namespaces? What is the difference between const, readonly, and static Difference between abstract class and interface? What is the use of async and await in C#? What is a delegate? How is it different from an event? What is LINQ? Can you show an example? Difference between IEnumerable, IQueryable, List? What is Dependency Injection in C#? What are extension methods? What are access modifiers in C#?

c#- dependency injection, oops -encapsulation, abstraction vs interface, access modifiers, sealed class vs private class, filters, routes, constant vs readonly vs static, ref vs out sql- index, sp vs function, null vs is null, optimise. code -- 1. Table:tblFru, columnName: Name, values: Apple, Orange Table:tblVeg, columnName:Name, values: Brinjal, Cauliflower Output: "Apple - Brinjal" "Apple - Cauliflower" "Orange - Brinjal" "Orange - Cauliflower" Select from tblFru cross join tblVeg 2. who don't have an address. t- employ -name t-add -for(e) Select name from e left join add on e.id=add.EID where add=null 3. salary -t 3rd high with x as ( Select *, Row_number over (partition by s order by a) from ) 4. try { throw new ArgumentNullException(); } catch(Exception ex) { throw new ArgumentNullException(); } catch(ArgumentNullException ex) { throw new ArgumentNullException(); } 5. Public int Add(int a, int b) { return a+b; } Public int Add(long a, long b) { return a+b; } Add(1,2) 6. Public int Add(int a, int b) { return a+b; } Public string Add(int a, int b) { return "a+b"; } String s = Add(1,2) 7. Interface IA { Int Add(int a, int b) } Interface IB { Int Add(int a, int b) } Class C: IA, IB { int Add (int a, int b) { return (a+b); } } 8. int a=2;, int b=3; ,* ,pre for ( var i=1; i
avatar

.NET Developer

Interviewed at Deloitte

3.6★
Aug 26, 2025

c#- dependency injection, oops -encapsulation, abstraction vs interface, access modifiers, sealed class vs private class, filters, routes, constant vs readonly vs static, ref vs out sql- index, sp vs function, null vs is null, optimise. code -- 1. Table:tblFru, columnName: Name, values: Apple, Orange Table:tblVeg, columnName:Name, values: Brinjal, Cauliflower Output: "Apple - Brinjal" "Apple - Cauliflower" "Orange - Brinjal" "Orange - Cauliflower" Select from tblFru cross join tblVeg 2. who don't have an address. t- employ -name t-add -for(e) Select name from e left join add on e.id=add.EID where add=null 3. salary -t 3rd high with x as ( Select *, Row_number over (partition by s order by a) from ) 4. try { throw new ArgumentNullException(); } catch(Exception ex) { throw new ArgumentNullException(); } catch(ArgumentNullException ex) { throw new ArgumentNullException(); } 5. Public int Add(int a, int b) { return a+b; } Public int Add(long a, long b) { return a+b; } Add(1,2) 6. Public int Add(int a, int b) { return a+b; } Public string Add(int a, int b) { return "a+b"; } String s = Add(1,2) 7. Interface IA { Int Add(int a, int b) } Interface IB { Int Add(int a, int b) } Class C: IA, IB { int Add (int a, int b) { return (a+b); } } 8. int a=2;, int b=3; ,* ,pre for ( var i=1; i

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