Which LINQ operator is used to filter elements in a collection based on a specified condition?
- GroupBy
- OrderBy
- Select
- Where
The "Where" LINQ operator is used to filter elements in a collection based on a specified condition.
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.
Scenario: You are working on a project that involves querying a list of products based on their category. Which LINQ operator would you use to accomplish this task?
- Select
- Where
- OrderBy
- GroupBy
The correct option for querying a list of products based on their category is the Where operator. The Where operator is used to filter elements based on a specified condition, allowing you to retrieve only the products that belong to a specific category.
The DataList control provides built-in support for ________ rendering, making it suitable for complex layouts.
- Custom
- Grid
- List
- Table
The DataList control in ADO.NET provides built-in support for tabular rendering, which makes it suitable for displaying data in complex layouts resembling tables. This makes it easier for developers to arrange and present data in a structured format within their web applications.
What is the purpose of the "Include" method in Entity Framework?
- To filter the result set based on a condition
- To limit the number of records returned
- To perform inner joins between tables
- To specify which related entities should be retrieved
The "Include" method in Entity Framework is used to specify which related entities should be retrieved along with the main entity. This helps in eagerly loading related data, preventing the need for additional queries when accessing navigation properties. By including related entities, Entity Framework can retrieve all the necessary data in a single query, improving performance by reducing database round-trips. This method is particularly useful in scenarios where you need to access related data efficiently, such as when fetching data for complex reports or displaying detailed views.
The Connection String can include authentication details such as ___________ and ___________.
- API Key and Token
- OAuth Token and Client Secret
- SSL Certificate and Private Key
- Username and Password
The connection string in databases often includes authentication details for establishing a connection. Typical authentication details may include a username and password. These credentials are used to verify the identity of the user accessing the database.
Which ADO.NET class is commonly used to update data in a dataset?
- SqlCommand
- SqlConnection
- SqlDataAdapter
- SqlDataReader
SqlDataAdapter is commonly used to update data in a dataset in ADO.NET. It acts as a bridge between the dataset and the data source, allowing developers to fill datasets with data from the database and update the database with changes made to the dataset.
Scenario: You want to implement a feature where users can group data by a specific column in the table. Which control would be more suitable for this task, DataGrid or DataGridView, and how would you achieve it?
- DataGrid with AllowGrouping property
- DataGrid with GroupingEnabled property
- DataGridView with AllowGrouping property
- DataGridView with GroupingEnabled property
To implement a feature where users can group data by a specific column in the table, the DataGridView control with the GroupingEnabled property enabled would be more suitable. This property allows users to group data by dragging column headers to the grouping area, providing a convenient way to organize and analyze information. With DataGridView, users can easily create custom groups and expand/collapse them as needed, enhancing the data presentation capabilities of the application.