Aurigo DOT NET Developer Interview Questions and Answers

Q1. Authentication,Authorization,Dependency Injection,
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Q1. Almost asked the basics of .net, c#, ADO. NET, SQL
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Q2. Difference between ref and out keywords?
Ans. 
The ref and out keywords are used in C# to pass arguments by reference instead of by value.
• The ref keyword is used to pass a variable by reference, allowing the called method to modify the value of the variable.

• The out keyword is similar to ref, but it is used when the called method needs to assign a value to the variable being passed.

• The ref keyword requires the variable to be initialized before passing it to the meth...read more
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Q3. Overloading and overriding concept and explanation ?
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Overloading is having multiple methods with the same name but different parameters. Overriding is implementing a method in a derived class with the same name and signature as in the base class.
• Overloading allows a class to have multiple methods with the same name but different parameters.

• Overriding allows a derived class to provide a different implementation of a method that is already defined in the base class.

• Overloa...read more
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Q4. SQL join queries with one example ?
Ans. 
SQL join queries are used to combine rows from two or more tables based on a related column between them.
• Join queries are used to retrieve data from multiple tables in a single query.

• Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

• Join conditions are specified using the ON keyword, which defines the column(s) to join on.

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = ta
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Q5. ADO .NET database calling steps ?
Ans. 
ADO .NET database calling steps involve establishing a connection, creating a command object, executing the command, and handling the results.
• Establish a connection to the database using a connection string

• Create a command object to specify the SQL query or stored procedure to be executed

• Execute the command to retrieve or modify data in the database

• Handle the results by reading data from a DataReader or updating data u
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Reverse a string without using liberary function

Round duration - 60 minutes
Round difficulty - Easy

The second round is also written but you need to write programming based on their concept.

Q1. 
Prime Numbers Identification
Given a positive integer N, your task is to identify all prime numbers less than or equal to N.
Explanation:
A prime number is a natural number greater than 1 that has no po...read more
Ans. 
Identify all prime numbers less than or equal to a given positive integer N.
• Iterate from 2 to N and check if each number is prime

• Use the Sieve of Eratosthenes algorithm for better efficiency

• Optimize by only checking up to the square root of N for divisors
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Q2. 
Palindrome String Validation
Determine if a given string 'S' is a palindrome, considering only alphanumeric characters and ignoring spaces and symbols.
Note:
The string 'S' should be evaluated in a case...read more
Ans. 
Check if a given string is a palindrome after removing special characters, spaces, and converting to lowercase.
• Remove special characters and spaces from the string

• Convert the string to lowercase

• Check if the modified string is a palindrome by comparing characters from start and end
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Round duration - 60 minutes
Round difficulty - Easy

Technical round with questions mainly on Java and OOPS concepts.

Q1. What is the difference between static methods and instance methods in Java?
Ans. 
Static methods belong to the class itself, while instance methods belong to individual objects of the class.
• Static methods are called using the class name, while instance methods are called using object references.

• Static methods cannot access instance variables directly, while instance methods can access both static and instance variables.

• Static methods are shared among all instances of the class, while instance method...read more
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Q2. What is the difference between an abstract class and an interface in Java?
Ans. 
Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.
• Abstract class can have constructors, member variables, and methods with implementation.

• Interface can only have abstract methods and constants.

• A class can implement multiple interfaces but can only extend one abstract class.

• Example: Abstract class - Animal with abstract method 'eat', Interface - Flyable with m
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Q3. What is the difference between ClassNotFoundException and NoClassDefFoundError in Java?
Ans. 
ClassNotFoundException occurs when a class is not found during runtime, while NoClassDefFoundError occurs when a class was found during compilation but not during runtime.
• ClassNotFoundException is a checked exception, while NoClassDefFoundError is an Error.

• ClassNotFoundException occurs when a class is not found at runtime, usually due to a missing classpath or incorrect class name.

• NoClassDefFoundError occurs when a cla...read more
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Q4. What is the difference between an Error and an Exception in Java?
Ans. 
Error is a serious issue that cannot be handled at runtime, while Exception is a recoverable issue that can be caught and handled.
• Error is a subclass of Throwable and is usually caused by the environment or system, such as running out of memory or stack overflow.

• Exception is also a subclass of Throwable but is caused by the application code, such as invalid input or file not found.

• Errors are unchecked and are not meant...read more
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Q5. What is SerialVersionUID in Java?
Ans. 
SerialVersionUID is a unique identifier used by Java to ensure the compatibility of serialized objects.
• SerialVersionUID is a static final long variable in a class that implements Serializable interface.

• It is used to ensure that the serialized object can be deserialized correctly even if the class definition has changed.

• If the SerialVersionUID of the serialized object does not match the one in the class, an InvalidClass...read more
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Q6. What are the requirements for creating an immutable class in Java?
Ans. 
Requirements for creating an immutable class in Java
• Make the class final so it cannot be extended

• Make all fields private and final

• Do not provide setter methods, only getter methods

• Ensure that mutable objects are not returned in getter methods

• Override equals() and hashCode() methods for proper comparison

• Consider making defensive copies of mutable fields in constructor or getter methods
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Q1. Oops? .net core features
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