Use exception handling to gracefully handle errors and prevent crashes. Exception handling is a programming technique that allows developers to handle errors that occur during program execution. In .NET Core and C#, exceptions are objects that represent errors that occur during program execution. When an error occurs, an exception is thrown, and the program can catch and handle the exception to prevent a crash.

Exception handling is useful because it allows developers to write code that is more robust and reliable. By handling exceptions, developers can prevent crashes and provide users with more meaningful error messages. Exception handling can also help developers identify and fix bugs in their code more quickly. When an exception is thrown, the program stops executing and displays an error message that includes information about the exception. This information can help developers identify the cause of the error and fix the bug that caused it.

Here is an example of how to use exception handling in C#:

try
{
    // code that may throw an exception
}
catch (Exception ex)
{
    // handle the exception
    Console.WriteLine("An error occurred: " + ex.Message);
}
finally
{
    // code that will always execute, regardless of whether an exception was thrown
}

In this example, the try block contains the code that may throw an exception. If an exception is thrown, the catch block will handle it and display an error message. The finally block contains code that will always execute, regardless of whether an exception was thrown. This block is useful for cleaning up resources that were allocated in the try block.