Driven IT Solutions DOT NET Developer Interview Questions and Answers

Given the task for the crud application

Q1. What is ViewState?
Ans. 
ViewState is a client-side state management technique used in ASP.NET to store page-specific data.
• ViewState is used to persist data between postbacks on a web page.

• It stores data in a hidden field on the page which is sent to the client and back to the server.

• ViewState is specific to a single page and is not shared between pages.

• It can be used to store simple data types like strings or complex objects.

• Example: ViewStat...read more
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Q2. What is Cookies?
Ans. 
Cookies are small pieces of data stored on the client's computer by the web server to track user activity and preferences.
• Cookies are used to store user preferences, login information, shopping cart items, etc.

• They can be set by the server using the Set-Cookie header in HTTP response.

• Cookies can be accessed and modified by the client-side scripts like JavaScript.

• They have an expiration date and can be either session co...read more
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Q3. What are Cache?
Ans. 
Cache is a hardware or software component that stores data so that future requests for that data can be served faster.
• Cache helps in improving the performance of applications by reducing the time taken to fetch data from the main memory or disk.

• Examples of cache include browser cache, CPU cache, and database cache.

• Cache can be implemented at different levels such as client-side cache, server-side cache, and distributed...read more
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Q4. What is Command Class?
Ans. 
Command Class is a class in .NET that represents a command to be executed.
• Command Class is used to encapsulate a command to be executed, along with any parameters or options.

• It helps in separating the command logic from the rest of the application.

• Examples include SqlCommand in ADO.NET for executing SQL commands and ProcessStartInfo in System.Diagnostics for starting external processes.
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Q5. What are Constraints?
Ans. 
Constraints are rules defined on a column to enforce data integrity and consistency in a database.
• Constraints ensure that data in a database meets certain criteria.

• Common types of constraints include NOT NULL, UNIQUE, PRIMARY KEY, FOREIGN KEY, and CHECK constraints.

• For example, a NOT NULL constraint ensures that a column cannot have a NULL value, while a UNIQUE constraint ensures that all values in a column are unique.
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Q6. What is Subquery?
Ans. 
A subquery is a query nested within another query, used to return data that will be used in the main query.
• Subqueries can be used in SELECT, INSERT, UPDATE, and DELETE statements.

• They can be used to retrieve data from one table based on values from another table.

• Subqueries can be correlated or non-correlated, depending on whether they reference columns from the outer query.

• Example: SELECT * FROM table1 WHERE column1 = ...read more
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Q7. What is PostBack?
Ans. 
PostBack is a mechanism in ASP.NET where the page is posted back to the server for processing.
• PostBack is triggered when a user interacts with a control on the page, such as clicking a button.

• The entire page is sent back to the server for processing, including the viewstate.

• PostBack can cause the page to reload, resulting in a full round trip to the server.
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1. A Function to wrtitten String is Palindrome or not?

2. Look at the series what number should come next? 7,10,8,11,9,12...

3. A man wants to bring a lion, a goat and grass across a river. The boat is tiny and can only cross one person at a time. If he leaves Lion and goat together, the lion will eat the goat. If the keeps Goat and grass together, the goat will eat the grass. How can he bring all three across the river?

4.You have 100 doors in a row that are initially closed. You make 100 passes through the doors starting with the first door everytime. The first time you visit the door and toggle the door( i.e if the door is closed, then it opens and if its open then it closed). The second time you only visit the second door(i.e 2nd,4th,6th etc.). The third time you only visit the 3rd door.(i.e 3rd,6th,9th). This goes on till 100. What state are the below doors in after the last pass? Which are open which are closed?

Door 16
Door 27
Door 44
Door 64
Door 75
Door 98

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