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The CommandType property can be set to ___________ when executing a text-based SQL query.

  • StoredProcedure
  • TableDirect
  • Text
  • Function
The correct option is Text. When executing a text-based SQL query using ADO.NET, you can set the CommandType property of the command object to Text. This indicates that the command text contains a SQL query statement to be executed directly against the database. Setting the CommandType to Text is appropriate for executing dynamic SQL queries or stored procedures that return rows.
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What is the purpose of the INotifyPropertyChanged interface in data binding?

  • It allows the data source to provide information about changes to its properties, enabling automatic updating of bound controls
  • It defines methods for controlling data binding behavior and handling data validation
  • It provides methods for navigating and manipulating data in a dataset
  • It specifies the data source for a control and the specific data member to bind to
The INotifyPropertyChanged interface is essential in data binding because it enables the data source to notify the UI controls when the value of a property changes. This notification mechanism ensures that the bound controls reflect the most up-to-date data from the data source.
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The let keyword in LINQ is used to define ___________ that can be reused within the query.

  • Constants
  • Functions
  • Objects
  • Variables
In LINQ, the let keyword is used to define variables that can be reused within the query. These variables allow for cleaner and more readable code by providing a way to store intermediate results or calculations for later use within the query.
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When using LINQ to DataSet, the let keyword is used to define ___________ variables within a query.

  • Temporary
  • Global
  • Static
  • Local
The correct option is 'Temporary'. In LINQ to DataSet, the let keyword is used to define temporary variables within a query. These variables can hold intermediate results or calculated values that are used within the query itself. They are scoped to the query in which they are defined and are not accessible outside of it.
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Migrations in Entity Framework Code-First are used to keep the database schema _________ with the application's data model.

  • Consistent
  • Independent
  • Isolated
  • Synchronized
Migrations in Entity Framework Code-First ensure that the database schema remains consistent with the application's data model as it evolves over time. They allow you to update the database schema automatically based on changes to your entity classes.
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Master-detail data binding is commonly used when displaying ___________ relationships from a database.

  • One-to-One
  • One-to-Many
  • Many-to-One
  • Many-to-Many
Master-detail data binding in ADO.NET is typically used to display one-to-many relationships from a database, making the correct option "One-to-Many".
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Scenario: You are building a database-driven application, and you need to add new records to a database table. Which ADO.NET command would you use for this task?

  • SqlCommand.ExecuteNonQuery()
  • SqlCommand.ExecuteQuery()
  • SqlCommand.ExecuteScalar()
  • SqlCommand.ExecuteXmlReader()
SqlCommand.ExecuteNonQuery() is the appropriate ADO.NET command for executing data manipulation language (DML) queries such as INSERT, UPDATE, DELETE, and MERGE. This command is used specifically for executing queries that do not return any result set, making it suitable for tasks like adding new records to a database table.
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In Entity Framework, the concept of ___________ allows you to customize how properties in an entity map to columns in a database table.

  • Code-First Migrations
  • Data Annotations
  • Entity Framework Code-First
  • Entity Framework Core
In Entity Framework, the concept of "Data Annotations" allows you to customize how properties in an entity map to columns in a database table. Data Annotations provide a way to override the default mapping behavior by specifying attributes directly on your entity classes. Examples include [Key] to define a primary key, [Column] to specify column names, and [MaxLength] to set column length constraints.
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Which data provider is used for connecting to MySQL databases in ADO.NET?

  • MySqlClient
  • OleDb
  • OracleClient
  • SqlClient
The MySqlClient data provider is specifically designed for connecting to MySQL databases in ADO.NET applications. It offers optimized performance, support for MySQL-specific features, and seamless integration with ADO.NET, enabling developers to interact with MySQL databases efficiently and effectively. Using the MySqlClient data provider ensures reliable connectivity and compatibility with MySQL database functionalities within ADO.NET applications.
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Scenario: You are working on an application that uses Entity Framework. You need to update a specific record in the database. What steps would you typically follow in Entity Framework to achieve this?

  • Connect to the database, retrieve the record using LINQ query, update the record properties, and call SaveChanges() method.
  • Execute a SQL UPDATE statement directly against the database using SqlCommand object.
  • Use DataAdapter to retrieve the record, update the necessary fields, and then update the database using DataAdapter.Update() method.
  • Use SqlCommandBuilder to automatically generate SQL UPDATE statements based on changes to the record properties.
In Entity Framework, to update a specific record, you typically follow these steps: Connect to the database using the DbContext, retrieve the record using LINQ query or Find() method, update the properties of the retrieved object, and finally call SaveChanges() method to persist the changes to the database. Using direct SQL commands or DataAdapter is not the recommended approach in Entity Framework.
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