What is the significance of parameters in SQL commands, and how do you handle them in ADO.NET?

Short answer: Parameters are used to pass values to SQL commands or stored procedures. They provide a way to safely and securely inject data into queries, reducing the risk of SQL injection attacks. In ADO.NET, you handle parameters using the Parameters collection of a SqlCommand object.

Example code

SqlCommand command = new SqlCommand("SELECT * FROM Customers WHERE CustomerID = @CustomerID", connection); command.Parameters.AddWithValue("@CustomerID", customerId);

Real-world example (ShopNest)

Always pass order ids with parameters: cmd.Parameters.AddWithValue("@id", orderId). Never concatenate user input into SQL.

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.