LINQ interview questions part 1
LINQ interview questions part 1
Take as many assements as you can to improve your validate your skill rating
Total Questions: 20
1. The full form of LINQ is _______.
Correct Answer is : Language-Integrated Query
2. LINQ supports ________ syntax.
Correct Answer is : C# and VB
3. Which of the following supports LINQ?
Correct Answer is : All of the above
4. A class must implement ____________ interface in order to provide querying facility using LINQ.
Correct Answer is : IEnumerable or IQueryable
5. Which of the following statement is TRUE?
Correct Answer is : LINQ API is a bunch of extension methods included in System.Linq.Enumerable and System.Linq.Queryable class.
6. Query alternative to the following SQL code in LINQ is : SELECT TOP 10 UPPER (c1.Name) FROM Customer c1 WHERE c1.Name LIKE 'A%' AND c1.ID NOT IN ( SELECT TOP 20 c2.ID FROM Customer c2 WHERE c2.Name LIKE 'A%' ORDER BY c2.Name ) ORDER BY c1.Name
Correct Answer is : var query =
FROM c IN db.Customers
WHERE c.Name.StartsWith ("A")
orderby c.Name
SELECT c.Name.ToUpper();
var thirdPage = query.Skip(20).Take(10);
7. Point out the correct statement :
Correct Answer is : All of the mentioned
8. LINQ query to retrieve a selection of customers, each with their high-value purchases is :
Correct Answer is : FROM c IN db.Customers
WHERE c.Address.State == "WA"
SELECT NEW
{
c.Name,
c.CustomerNumber,
HighValuePurchases = c.Purchases.Where (p => p.Price > 1000)
}
9. LINQ Query to list all purchases of $1000 or greater made by customers who live in Washington :
Correct Answer is : FROM p IN db.Purchases
WHERE p.Customer.Address.State == "WA" || p.Customer == NULL
WHERE p.PurchaseItems.Sum (pi => pi.SaleAmount) > 1000
SELECT p
10. Point out the wrong statement :
Correct Answer is : Compared to SQL, LINQ is complex, tidier, and lower-level
11.
public bool IsValidUser(string userName, string passWord)
{
DBNameDataContext myDB = NEW DBNameDataContext();
List users = myDB.Users.Where(u => u.Username == userName && u.Password==passWord);
IF(users.Count>0)
{
RETURN TRUE;
}
RETURN FALSE;
}
This code is used will perform _________ operation in LINQ.
Correct Answer is : select
12. Which of the following code snippet would traverse through all result objects ?
Correct Answer is : foreach(USER USER IN userResults)
{
//checking the RESULT AS LIKE object
IF(USER.Role == 'admin')
{
//do whatever you need
}
}
13. LINQ to SQL is considered to be one of Microsoft’s _______ products.
Correct Answer is : ORM
14. LINQ to SQL in SQL Server fully supports :
Correct Answer is : All of the mentioned
15. LINQ to Entities applications requires __________ mapping provider.
Correct Answer is : EntityClient
16. The ______ pre-compiler translates embedded SQL into calls to the Oracle runtime library.
Correct Answer is : Pro*C
17. Point out the correct statement :
Correct Answer is : If you want to work against a conceptual data model, use LINQ to Entities
18. DataContext object is constructed in LINQ to SQL using :
Correct Answer is : NorthwindDataContext db = new NorthwindDataContext();
19. Which of the following code will retrieve all products in the Beverages category sorted by product name ?
Correct Answer is : IEnumerable beverages = FROM p IN db.Products
WHERE p.Category.CategoryName == "Beverages"
orderby p.ProductName
SELECT p;
20. Which of the following sample code is used to retrieve single row at a time ?
Correct Answer is : public USER GetUser(string userName)
{
DBNameDataContext myDB = NEW DBNameDataContext();
USER USER = myDB.Users.Single(u, u.UserName=>userName);
RETURN USER;
} ?
