Summary  
This chapter covers using try-catch blocks around parsing code and looping until a break to implement code that prompts for input and handles format exceptions, ensuring the program doesn’t crash on invalid entries.

General domain of usage  
User input validation

### Recap:

- `try-catch` blocks can be used for avoiding program crashes in case of invalid inputs;
- The code that parses user input can be enclosed into a `try` block, and an error message can be displayed to the user via the `catch` block in case the parsing fails;
- We can enclose the `try-catch` block into an infinite `while` loop, which breaks after the user input is successfully parsed and stored. This way, we can make sure that instead of crashing, the program prompts the user for input until the user gives the correct input.


In a try-catch structure, where should the code that might throw an exception be placed?

What will happen if the user enters "abc" when prompted?

This course will give you a solid foundation to begin making applications using .NET in C#. Covering console applications, asynchronous programming, web services, database fundamentals, and ADO.NET CRUD operations, you'll gain practical skills. From creating apps and handling exceptions to optimizing database access, this course ensures a robust understanding of essential .NET development concepts.

In this section we will learn about what is .NET, how to setup the development environment and how to start making some console apps. Apart from that we will also learn how to take input from the user in the console for making interactive applications.

In this section, we will be learning how to perform multiple tasks at once to improve the performance and responsiveness of applications. We will also briefly learn what Web Services and APIs are. This will give us an introduction to how the internet and websites work. We will also learn how to use APIs.

In this section we will learn what are databases, specifically what are SQL databases and how to create them. We will study their structure and will learn to perform some basic operations on the databases. This chapter will serve as an introduction to ADO.NET which is a .NET module used for interacting with databases.

In this section, we'll cover the fundamental CRUD operations (Create, Read, Update, Delete) using SQL. We'll explore SQL syntax at a basic level and recap how to implement each SQL statement in C# code. While some parts may serve as a review from the previous section, this will provide a solid understanding of essential database concepts, enabling you to understand both the SQL and C# code and write it independently.

In this chapter we will learn about additional functions or methods for making database management more efficient. For-example executing multiple SQL commands at once using Stored Procedures, and retrieving data in bulk from the SQL database using DataSet.

Dealing with Exceptions caused by User Input

Recap:

1. In a try-catch structure, where should the code that might throw an exception be placed?

2. What will happen if the user enters "abc" when prompted?