Interview Q&A

Short answer: In an ASP.NET WebForms application, you can use the GridView control to display data from a database by following these steps:

Real-world example (ShopNest)

ShopNest’s reporting job still uses ADO.NET for a heavy SQL query where raw performance and stored procedures matter more than EF convenience.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: When working with large datasets in ADO.NET, it's crucial to ensure that the application does not run into performance issues, such as excessive memory usage or long wait times. Here are some strategies to efficiently retrieve large data:

Real-world example (ShopNest)

ShopNest’s reporting job still uses ADO.NET for a heavy SQL query where raw performance and stored procedures matter more than EF convenience.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Concurrency issues occur when multiple users attempt to update the same data simultaneously. There are two main strategies to handle concurrency in ADO.NET:

Real-world example (ShopNest)

ShopNest’s reporting job still uses ADO.NET for a heavy SQL query where raw performance and stored procedures matter more than EF convenience.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: Data validation ensures that the data being inserted into the database is correct and consistent. You can perform validation at various stages, including the client side (e.g., using JavaScript in a web application) and server side (using ADO.NET). Steps for Server-Side Validation:

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.

Short answer: The BatchUpdate method is used to send multiple SQL commands (such as insert, update, or delete) in a single round trip to the database.

Explain a bit more

This improves performance by reducing the overhead of sending multiple individual commands. While BatchUpdate isn't directly exposed as a method on the DataAdapter object, you can achieve similar functionality by manually creating a batch of commands and executing them in a single call. Example (Using SqlDataAdapter): SqlDataAdapter adapter = new SqlDataAdapter("SELECT * FROM Customers", connection); SqlCommandBuilder builder = new SqlCommandBuilder(adapter); // Automatically generates commands for Update, Insert, and Delete DataTable table = new DataTable(); adapter.Fill(table); // Modify DataTable as needed // Update changes to the database in one go (BatchUpdate) adapter.Update(table);

Real-world example (ShopNest)

ShopNest’s reporting job still uses ADO.NET for a heavy SQL query where raw performance and stored procedures matter more than EF convenience.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.