What is an anonymous type in LINQ, and how is it used?
- It is a predefined type in LINQ used for query expressions.
- It is a type created dynamically at runtime to encapsulate data.
- It is a type that can only be used within LINQ queries.
- It is a type with no name used for declaring variables.
An anonymous type in LINQ is a type created dynamically at runtime to encapsulate data. It allows you to define a new type without explicitly declaring a class or struct. Anonymous types are typically used to store the results of query expressions or to project data into a new shape. They are convenient for one-time use cases where defining a formal type would be unnecessary overhead. However, they cannot be used outside of the method or scope where they are defined.
When updating data with Entity Framework, you should call the ___________ method to persist the changes to the database.
- ApplyChanges()
- Commit()
- SaveChanges()
- Update()
To persist changes made to data in Entity Framework, you should call the SaveChanges() method. This method commits the changes to the underlying database, ensuring data consistency.
Setting the Nested property of a DataRelation to ___________ enables multi-level hierarchies.
- 0
- 1
- FALSE
- TRUE
When you set the Nested property of a DataRelation to True, it enables the creation of multi-level hierarchies in your DataSet. This means you can navigate through multiple levels of related data using this DataRelation.
The ParentKeyConstraint ensures that parent keys are ___________ and unique.
- Consistent
- Maintained
- Referenced
- Valid
The ParentKeyConstraint in ADO.NET ensures that the parent keys in a relational database are valid, meaning they exist in the parent table, and unique, ensuring data integrity and referential integrity.
To optimize performance in LINQ to Entities, you can use the ___________ method to load related data.
- Deferred
- Eager
- Explicit
- Lazy
In LINQ to Entities, the "Include" method is used to eagerly load related data, which can help optimize performance by reducing the number of database queries executed.
What is the role of the Update method in a DataAdapter?
- Adds new rows to the DataSet
- Clears all data from the DataSet
- Executes an SQL statement to retrieve data from the database
- Propagates changes from a DataSet back to the database
The role of the Update method in a DataAdapter is to propagate changes made within a DataSet back to the underlying database. After modifying data within the local DataSet, such as adding, updating, or deleting rows, the Update method is called to synchronize these changes with the corresponding data in the database. This involves generating and executing appropriate SQL statements, such as INSERT, UPDATE, and DELETE, to reflect the modifications made in the DataSet back to the relevant database tables. By invoking the Update method, the DataAdapter ensures consistency between the application's data and the database, facilitating data persistence and integrity.
What is the purpose of the DataMember property in data binding?
- Determines the type of data displayed in a grid view
- Manages the data flow between multiple controls
- Specifies the data source for the BindingSource component
- Specifies the name of the data source column to bind to the UI control
The DataMember property in data binding is used to specify the name of the data source column to which a UI control is bound. It indicates which column from the data source should be displayed or manipulated in the UI control, facilitating proper data representation and interaction in WinForms applications.
When working with non-query commands, what does the ExecuteNonQuery method return as a result?
- Error message
- Result set
- Rows affected
- Scalar value
The ExecuteNonQuery method in ADO.NET returns the number of rows affected by the command, typically used with INSERT, UPDATE, DELETE queries. It does not return a result set or a scalar value. If there's an error, it may throw an exception.
In ADO.NET, what are the steps involved in updating data using a DataAdapter?
- Fill the DataSet with data from the database
- Initialize the DataAdapter with appropriate SQL commands
- Modify the data in the DataSet
- Update the database with changes from the DataSet
A DataAdapter in ADO.NET acts as a bridge between a database and a DataSet. To update data, the DataAdapter first fills the DataSet with data from the database, modifies the data within the DataSet, and then updates the database with the changes made in the DataSet.
When modifying data in datasets, what is the significance of the DataAdapter's Update method?
- Connects to the database
- Ensures changes are saved back to the database
- Executes SQL commands
- Retrieves data from the database
The DataAdapter's Update method is significant because it applies changes made to a DataSet back to the database. It synchronizes changes made in the DataSet with the corresponding rows in the database, ensuring that any modifications, deletions, or additions are reflected in the underlying data source.