The code provided constructs an SQL query by directly concatenating user input (Request("ItemID")) with the query string. This approach is vulnerable to SQL injection attacks, where malicious input can be crafted to manipulate or compromise the database.
Query parameterization ensures that user input is treated as a parameter rather than executable code. By using parameterized queries, the database engine automatically escapes and safely handles input, eliminating the risk of SQL injection. This is the recommended best practice to secure database interactions against such vulnerabilities.