Advanced features like sorting, filtering, and grouping can be achieved using ___________ capabilities of these controls.

  • DataGridFeatures
  • DataGridOperations
  • DataManipulation
  • DataView
Advanced features like sorting, filtering, and grouping can be achieved using DataView capabilities of these controls. DataView allows for various operations like sorting, filtering, and grouping of data.

In WinForms, what are the key steps involved in setting up data binding for a control?

  • Create a new data binding context, assign the data source to the control, set the data source's properties, bind the data source to the control
  • Define the data source, set the DataField property, set the DataSource property, call the UpdateData method
  • Define the data source, set the DataMember property, set the DataSource property, call the DataBind method
  • Set the DataBinding property to True, define the data source, set the BindingContext property, call the Refresh method
Setting up data binding in WinForms involves defining the data source, setting the DataMember property to specify the specific data member to bind to, setting the DataSource property to specify the data source object, and finally calling the DataBind method to apply the binding.

Scenario: You are tasked with developing a web application that collects user input and inserts it into a SQL Server database. How can you prevent SQL injection in this scenario?

  • Escaping special characters
  • Sanitize input
  • Use an ORM (Object-Relational Mapping)
  • Use parameterized queries
Using parameterized queries is an effective defense against SQL injection attacks. It allows the database engine to distinguish between SQL code and data, preventing malicious SQL code injection. Sanitizing input is not as reliable as parameterized queries and may still leave vulnerabilities. Escaping special characters can be prone to human error and might not cover all possible injection vectors. Using an ORM can also help prevent SQL injection, but it's not as direct and reliable as using parameterized queries.

Scenario: You have two collections of objects, orders and customers, and you need to retrieve a list of orders along with their corresponding customer information. Which LINQ operator would you use for this task?

  • Join
  • Select
  • GroupJoin
  • Concat
The correct option is Join. The Join operator is used to combine two collections based on a related key and select the result into a new collection. In this scenario, you would use Join to combine the orders and customers collections based on a common key, such as CustomerID, to retrieve a list of orders along with their corresponding customer information.

The ExecuteNonQuery method of a command object is typically used for executing _______ SQL commands.

  • Insert
  • Non-Query
  • Select
  • Update
The ExecuteNonQuery method is used to execute SQL commands that do not return data, such as INSERT, UPDATE, DELETE, or any SQL command that does not return a result set. It is commonly used for executing data manipulation language (DML) statements.

What are some common list controls used in ADO.NET for data binding purposes?

  • ListBox
  • DropDownList
  • ComboBox
  • RadioButtonList
In ADO.NET, common list controls used for data binding include ListBox, DropDownList, ComboBox, and RadioButtonList. These controls facilitate displaying data retrieved from a data source, providing users with options to select or interact with the data displayed. DropDownList, specifically, is commonly used for displaying a list of items where users can select one option.

Your application involves updating records across different databases. How would you implement distributed transaction management in ADO.NET?

  • Data Reader
  • OleDbConnection
  • SqlCommand
  • TransactionScope
Distributed transaction management in ADO.NET can be implemented using TransactionScope. TransactionScope provides a simple and efficient way to manage distributed transactions across multiple databases or resource managers. It automatically handles enlisting connections in the transaction and ensures that either all operations across different databases succeed or fail together, maintaining data integrity and consistency.

Scenario: You are developing a WinForms application that needs to display a list of products from a database. Which control and data binding method would you use to achieve this?

  • DataGridView with DataSource property
  • ListBox with DataBinding event
  • ComboBox with DisplayMember property
  • DataGrid with Bind method
The correct option is DataGridView with DataSource property. DataGridView is a versatile control for displaying tabular data and supports data binding through its DataSource property, which allows you to easily bind it to a data source such as a DataTable or a list of objects. This control provides rich functionality for displaying and editing data in a grid format, making it suitable for displaying a list of products from a database.

Which event is triggered when a user selects a row in a DataGrid or DataGridView control?

  • CellValueChanged
  • RowEnter
  • RowHeaderMouseClick
  • RowSelected
The "RowEnter" event is triggered when a user selects a row in a DataGrid or DataGridView control. This event occurs when the focus moves to a new row, indicating that the user has selected that row. It provides an opportunity to perform actions based on the selected row, such as retrieving data or updating other controls.

What happens to the data reader when you close the associated database connection?

  • The data reader becomes null
  • The data reader is disposed automatically
  • The data reader remains open
  • The data reader throws an exception
When you close the associated database connection, the data reader throws an exception. This is because the data reader relies on the connection to fetch data from the database. Closing the connection while the data reader is still in use results in an exception being thrown to indicate the invalid operation. It's essential to close the data reader before closing the connection to avoid this issue.