Freshers / Beginner level questions
Freshers / Beginner level questions & answers
Ques 1. What is LINQ?
Language-Integrated Query (LINQ) is a set of features in C# and VB.NET that allows you to write queries directly into your code.
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Ques 2. What is deferred execution in LINQ?
Deferred execution means that the execution of the query is delayed until the result is actually enumerated or a terminal operation is called.
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Ques 3. Explain the concept of anonymous types in LINQ.
Anonymous types allow you to create objects without defining a formal class structure. They are often used in LINQ queries to return a subset of properties.
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Ques 4. What is the purpose of the 'orderby' clause in LINQ?
The 'orderby' clause is used to sort the elements of a sequence in ascending or descending order.
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Ques 5. What is the purpose of the 'Select' method in LINQ?
The 'Select' method is used to transform each element of a sequence by applying a specified function, and it returns a new sequence of the transformed elements.
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Ques 6. What is the difference between 'FirstOrDefault' and 'First' methods in LINQ?
'FirstOrDefault' returns the first element of a sequence or a default value if the sequence is empty, while 'First' returns the first element and throws an exception if the sequence is empty.
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var firstItemWithValue = myList.First();
Ques 7. What is the purpose of the 'Any' method in LINQ?
'Any' is used to determine whether any elements of a sequence satisfy a given condition. It returns true if any element satisfies the condition, otherwise false.
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Ques 8. Explain the usage of the 'Concat' method in LINQ.
'Concat' is used to concatenate two sequences, creating a new sequence that contains elements from both sequences.
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Ques 9. What is the purpose of the 'Distinct' method in LINQ?
'Distinct' is used to eliminate duplicate elements from a sequence and return a new sequence with unique elements.
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