Data binding in WinForms allows you to establish a link between a data source and a ___________ control.
- ComboBox
- DataGrid
- DataGridView
- TextBox
Data binding in WinForms allows you to establish a link between a data source, such as a database or a collection, and a control that can display data. The DataGridView control is used to display and edit tabular data and is commonly used for data binding in WinForms applications.
To add a new row to a DataTable in a dataset, you typically use the ___________ method.
- Insert
- Create
- Append
- Add
The correct option is "Add". When adding a new row to a DataTable in a dataset, the common method used is the Add method of the DataRow collection.
ADO.NET provides mechanisms to automatically ___________ and ___________ connections when they are no longer needed.
- Close; Dispose
- Connect; Disconnect
- Open; Close
- Open; Dispose
In ADO.NET, the methods Open() and Dispose() are used to respectively establish and release connections. The Open() method opens a connection to a data source, while the Dispose() method releases the resources used by the connection.
Scenario: Your application requires real-time updates of data in the UI whenever changes occur in the database. Which type of data binding would be suitable for this scenario, and why?
- Two-way data binding
- One-way data binding
- Observer pattern
- Three-way data binding
The correct option is Observer pattern. In this scenario, where real-time updates are needed in the UI, the Observer pattern would be suitable. The Observer pattern allows objects to subscribe to changes in other objects and receive notifications when those changes occur. This enables real-time updates in the UI whenever changes happen in the database, ensuring synchronization between the database and the UI. Two-way data binding allows updates from UI to data source and vice versa, but it might not provide real-time updates. One-way data binding only updates the UI from the data source, and Three-way data binding is not a standard concept in ADO.NET.
In ADO.NET, what is the purpose of the DataGrid control in the context of data binding?
- Binding data to UI controls
- Displaying data in a tabular format
- Executing SQL queries
- Retrieving data from a database
The DataGrid control in ADO.NET is primarily used for displaying data in a tabular format. It allows users to view data retrieved from a data source, such as a database, in a structured grid layout. This makes it easier for users to visualize and interact with the data.
In which technology or platform are DataGrid and DataGridView controls commonly used?
- .NET Framework
- Android
- Java
- iOS
DataGrid and DataGridView controls are commonly used in the .NET Framework platform. They are part of the Windows Forms technology used for building desktop applications in languages such as C# or VB.NET.
In LINQ to SQL, the SubmitChanges method is used to _______ changes to the database.
- apply
- commit
- execute
- persist
The SubmitChanges method in LINQ to SQL is used to commit changes made to objects in the DataContext to the associated database. This method ensures that changes are saved to the database.
In ADO.NET, you can execute a stored procedure using the ___________ method of the SqlCommand object.
- Execute
- ExecuteNonQuery
- ExecuteReader
- ExecuteScalar
In ADO.NET, you can execute a stored procedure using the ExecuteNonQuery method of the SqlCommand object. ExecuteNonQuery is typically used for executing commands that do not return any result set, such as INSERT, UPDATE, DELETE, or for executing stored procedures that do not return result sets.
When working with DataViews, what is the significance of the Sort property?
- The Sort property defines the sorting algorithm used by the DataView.
- The Sort property indicates whether the DataView allows sorting operations.
- The Sort property is used to sort the DataView's columns in ascending or descending order.
- The Sort property specifies the order in which the data rows are displayed in the DataView.
The Sort property of a DataView is significant as it specifies the order in which the data rows are displayed. This property allows you to sort the DataView's rows based on the values of one or more columns, either in ascending or descending order, providing control over the presentation of data.
Which LINQ technology is more suitable for querying in-memory data structures like lists and arrays?
- LINQ to DataSet
- LINQ to Objects
- LINQ to SQL
- LINQ to XML
LINQ to Objects is specifically designed for querying in-memory data structures such as lists, arrays, and other collections. It allows developers to use LINQ query expressions to manipulate and retrieve data from these data structures efficiently.