The primary difference between a dataset and a data reader in ADO.NET is that a dataset provides disconnected access to data, meaning it retrieves and stores data in memory independently of the data source. On the other hand, a data reader provides connected access to data, requiring an active connection to the data source while reading data sequentially. This fundamental distinction impacts factors such as performance, memory usage, and flexibility in data manipulation.

To enable users to edit data within the displayed table, you would set the EditingEnabled property to true in the chosen control, such as DataGridView. This property allows users to modify cell values directly within the grid, providing a seamless editing experience. By enabling editing functionality, users can make changes to the data without the need for additional forms or dialogs, enhancing the usability of the application.

LINQ stands for "Language Integrated Query". It allows developers to query various data sources using a syntax similar to SQL.