What happens if you call the Commit method of a transaction and an exception occurs during the commit process?
- The transaction is committed, and the changes are persisted in the database.
- The transaction is partially committed, leaving the database in an inconsistent state.
- The transaction is rolled back.
- The transaction remains in a pending state until the exception is resolved.
If an exception occurs during the commit process after calling the Commit method of a transaction, the transaction is rolled back to maintain data integrity. This ensures that either all changes are successfully committed, or none of them are.
When working with a Dataset, what does the AcceptChanges method do?
- Commits all changes made to the dataset since it was loaded or since the last AcceptChanges call
- Rolls back all changes made to the dataset since it was loaded or since the last AcceptChanges call
- Marks all rows in the dataset as deleted
- Adds a new row to the dataset
The AcceptChanges method in ADO.NET commits all changes made to the dataset since it was loaded or since the last AcceptChanges call. This means that any changes to the data become permanent and cannot be rolled back. The other options do not accurately describe the purpose of the AcceptChanges method.
DataViews in ADO.NET are used to provide ___________ and sorting capabilities to DataTables.
- Aggregation
- Filtering
- Grouping
- Querying
DataViews in ADO.NET are used to provide filtering and sorting capabilities to DataTables. They allow you to create customized views of the data within a DataTable, applying filters to display only the rows that meet specific criteria and sorting the rows based on one or more columns.
What is a DataView in ADO.NET primarily used for?
- Filtering data
- Grouping data
- Retrieving data
- Sorting data
A DataView in ADO.NET is primarily used for filtering data. It allows you to apply filtering criteria to a DataTable and create a view that displays only the rows that meet the specified conditions. This is useful for displaying subsets of data based on certain criteria, improving performance, and simplifying data presentation for the user.
ADO.NET provides the _________ class to work with stored procedures, which allows for flexible parameter handling.
- SqlCommand
- SqlConnection
- SqlDataAdapter
- SqlParameter
The SqlParameter class in ADO.NET is used to define parameters for stored procedures. It allows developers to specify various properties for each parameter, including its name, data type, size, and direction (input or output). This class facilitates flexible parameter handling and ensures proper interaction with stored procedures.
How can you customize the appearance of cells in a DataGrid or DataGridView?
- By adjusting the Padding property
- By changing the TextAlign property
- By handling the CellFormatting event
- By setting the AutoSizeColumnsMode property
You can customize the appearance of cells in a DataGrid or DataGridView control by handling the "CellFormatting" event. This event allows you to specify custom formatting for individual cells based on criteria such as their values or positions. By handling this event, you can modify various aspects of cell appearance, including font style, background color, and content alignment.
In LINQ to DataSet, which method is used to sort the result set in ascending order based on a specified column?
- Ascending()
- OrderBy()
- Sort()
- SortBy()
The correct method to sort the result set in ascending order based on a specified column in LINQ to DataSet is OrderBy(). This method sorts the elements of a sequence in ascending order according to a key. It allows you to specify the column based on which you want to sort the data.
When working with disconnected data in ADO.NET, what is the purpose of the RowVersion column in a DataTable?
- It stores the foreign key references for related rows.
- It stores the index of each row in the DataTable.
- It stores the primary key of each row.
- It stores the timestamp indicating when the row was last updated.
In ADO.NET, the RowVersion column, also known as the Timestamp column, is used to track changes to rows in a DataTable when working with disconnected data. It stores a value that represents the timestamp of when the row was last updated. This is crucial for concurrency management, allowing ADO.NET to detect whether any changes have been made to a row since it was last retrieved from the database.
Which LINQ operator is used for grouping elements based on a common attribute or key?
- GroupBy
- OrderBy
- Select
- Where
The GroupBy operator in LINQ is used to group elements from a data source based on a common attribute or key. It creates groups of elements that share the same value for the specified attribute, allowing for easy aggregation or further analysis of the data. GroupBy is particularly useful when working with datasets that need to be organized into logical groups for processing.
In data binding, the ___________ control is responsible for displaying data to the user.
- TextBox
- ListBox
- DataGridView
- DataGrid
The correct option is TextBox. In ADO.NET, data binding is a mechanism for synchronizing the data in your application's data sources with its user interface controls. TextBox controls are commonly used to display data to the user in Windows Forms applications, making them responsible for displaying data to the user in the context of data binding.