Citco Junior .NET Developer Interview Questions, Process, and Tips

2 coding questions were given with 40 min time limit

Q1. Difference between ref, out params
Ans. 
ref and out are both used for passing arguments by reference in C#, but out parameters are not required to be initialized before being passed.
• ref parameters must be initialized before being passed to a method, while out parameters do not need to be initialized

• out parameters are typically used for returning multiple values from a method

• ref parameters can be used for both input and output, while out parameters are typica
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Q2. Realtime example of static class
Ans. 
A static class is a class that cannot be instantiated and is used to group related methods and properties.
• Static classes are commonly used for utility classes that contain helper methods.

• They are also used for defining extension methods.

• Example: Math class in C# contains static methods like Math.Max() and Math.Min().
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Q3. Difference between first, single
Ans. 
First returns the first element of a sequence, while Single returns the only element of a sequence or throws an exception if there is not exactly one element.
• First is used to retrieve the first element of a sequence, while Single is used to retrieve the only element of a sequence.

• First does not throw an exception if there are no elements in the sequence, while Single throws an exception in this case.

• Example: var number...read more
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Q4. What is interface
Ans. 
An interface in .NET is a reference type that defines a contract for classes to implement certain methods and properties.
• Interfaces contain method signatures but no implementation.

• Classes can implement multiple interfaces.

• Interfaces are used for achieving abstraction and multiple inheritance in .NET.

• Example: 'IComparable' interface in C# is used for comparing objects.
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Q5. Difference between authentication, authorization
Ans. 
Authentication verifies the identity of a user, while authorization determines what actions a user is allowed to perform.
• Authentication confirms the user's identity through credentials like username and password.

• Authorization controls the access rights of authenticated users to specific resources or actions.

• Example: Logging into a website with a username and password is authentication. Accessing certain pages or featur
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