To implement custom data binding, you can create a custom class that implements the ___________ interface.
- IBindable
- IDataBinding
- ICustomDataBinding
- INotifyPropertyChanged
The correct option is INotifyPropertyChanged. This interface is commonly used in .NET for implementing custom data binding. It notifies clients that a property value has changed, which is essential for data binding scenarios.
To perform an outer join in LINQ, you can use the DefaultIfEmpty() method in conjunction with the ___________ clause.
- Where
- GroupBy
- Join
- Select
In LINQ, to perform an outer join, you use the "Join" clause and combine it with the "DefaultIfEmpty()" method. The "Join" clause is essential for joining tables, making it the correct option.
Scenario: Your project requires support for multiple database providers, such as SQL Server, Oracle, and MySQL. Which feature of Entity Framework should you consider to achieve this flexibility?
- Database Context
- Database Providers
- Entity Framework Core
- Model-First Approach
Entity Framework Core supports multiple database providers through the concept of Database Providers. By specifying the appropriate provider in the DbContext configuration, you can switch between different databases seamlessly without changing much of the application code. Entity Framework Core is designed to be lightweight and extensible, making it suitable for cross-platform development and supporting various database providers. Model-First Approach is a design methodology for creating the data model visually, but it doesn't inherently support multiple database providers. Database Context is a component within Entity Framework but doesn't directly address the requirement for multiple database support.
Entity Framework supports different query execution modes, such as _______ and _______.
- Deferred Loading
- Eager Loading
- Explicit Loading
- Lazy Loading
Entity Framework provides various query execution modes to retrieve data from the database efficiently. Lazy loading delays the loading of related entities until they are explicitly accessed, reducing the initial load time. Eager loading loads related entities along with the main entity in a single query, which can improve performance by reducing the number of database round-trips. Explicit loading allows developers to selectively load related entities on demand. Deferred loading, also known as delayed loading, defers the loading of related entities until they are accessed for the first time, which can enhance performance by fetching only the necessary data when needed.
Scenario: You need to retrieve data from an XML document. Which LINQ technology can be used for querying XML data?
- LINQ to Entities
- LINQ to Objects
- LINQ to SQL
- LINQ to XML
LINQ to XML is designed for querying and manipulating XML data. It allows developers to write LINQ queries against XML documents, providing a convenient and expressive way to extract and process XML data.
DataViews are particularly useful when you want to present a ___________ of your data to the user.
- Sorted view
- Filtered view
- Virtualized view
- Customized view
DataViews in ADO.NET are versatile tools for data manipulation. They allow you to present a customized view of your data to the user. This can include sorting, filtering, and applying custom logic to the data, hence "Customized view" is the correct option.
Scenario: Your WinForms application requires the user to edit and save customer information. How can you ensure that changes made in a data-bound control are propagated back to the data source?
- Implement the INotifyPropertyChanged interface
- Use the DataBindingComplete event
- Call the Update method of the data adapter
- Set the DataPropertyName property of the data-bound control
The correct option is Call the Update method of the data adapter. When working with data-bound controls in WinForms applications, changes made in the controls need to be saved back to the underlying data source. One way to achieve this is by calling the Update method of the data adapter associated with the data source. This method applies changes made in the data-bound controls to the database.
How can parameterized queries help prevent SQL injection attacks?
- By encrypting the SQL commands
- By restricting database access
- By separating data from SQL commands
- By using complex SQL queries
Parameterized queries help prevent SQL injection attacks by separating data from SQL commands. With parameterized queries, user inputs are treated as data rather than executable commands, reducing the risk of malicious SQL injection. Parameters act as placeholders for user-supplied values, preventing attackers from injecting SQL code into the query. This practice enhances security by ensuring that user input is sanitized and properly handled, mitigating the risk of unauthorized access or data manipulation.
A stored procedure is a precompiled ___________ of SQL statements.
- collection
- grouping
- sequence
- set
A stored procedure is a precompiled sequence of SQL statements that are stored in the database and can be executed by applications. They offer advantages such as improved performance as they are precompiled and cached, reducing parsing overhead. Additionally, they provide security by controlling access to data through parameterized queries.
In ADO.NET, what are the different ways to call a stored procedure?
- Call() method, Invoke() method, ExecuteProcedure() method, Run() method
- CommandText property, ExecuteNonQuery() method, ExecuteReader() method, ExecuteScalar() method
- ExecuteNonQuery() method, ExecuteScalar() method, ExecuteReader() method, Execute() method
- ExecuteStoredProc() method, ExecuteStoredProcedure() method, ExecuteSP() method, CallStoredProc() method
In ADO.NET, you can call a stored procedure using the ExecuteNonQuery() method to execute a command that doesn't return any result set, ExecuteScalar() method to execute a command that returns a single value, and ExecuteReader() method to execute a command that returns a result set. The Execute() method can also be used to execute any type of command.