C# Exception Handling

In C#, exceptions are used to handle runtime errors or abnormal conditions that occur during program execution. Exception handling is an essential part of writing robust and reliable code. In this tutorial, we'll discuss how to handle exceptions in C#.

Syntax

The syntax for handling exceptions in C# is as follows:

try {
   // code that might raise an exception
}
catch (ExceptionName e) {
   // code to handle the exception
}
finally {
   // code that executes regardless of whether an exception was thrown
}

The "try" block is used to enclose the code that might raise an exception. "catch" blocks are used to handle any exceptions that are thrown. "finally" blocks are used to specify code that should execute, regardless of whether an exception was thrown or not.

Example

Let's say we want to divide two numbers and handle the "divide by zero" error that might occur. Here's how we can handle the exception:

int numerator = 10;
int denominator = 0;
try {
   int result = numerator / denominator;
   Console.WriteLine(result);
}
catch (DivideByZeroException e) {
   Console.WriteLine("Cannot divide by zero.");
}
finally {
   Console.WriteLine("Program completed.");
}

Output

When we run the example code above, the output will be:

Cannot divide by zero.
Program completed.

This is because we attempted to divide by zero, causing an exception to be thrown, which was then caught and handled by the catch block. The finally block then executed, regardless of whether an exception was thrown or not.

Explanation

In the example above, we attempted to divide two numbers and handled the "divide by zero" error that might occur. We used a try-catch-finally block to enclose the code that might raise an exception, specify code that should run when an exception is caught, and code that should run regardless of whether an exception was thrown.

Use

Exception handling is essential in writing robust and reliable code. It allows you to handle runtime errors or abnormal conditions that occur during program execution and recover from them gracefully.

Important Points

• Always catch the specific exceptions that can be thrown by the code in the try block. Avoid catching the general "Exception" class unless you have to.
• Rethrow the exception if it cannot be handled in the catch block.
• Leave the finally block to release resources or state that are acquired in the try block.

Summary

In this tutorial, we discussed how to handle exceptions in C#. We covered the syntax, example, output, explanation, use, and important points of exception handling in C#. With this knowledge, you can now use exception handling in your C# code to handle runtime errors or abnormal conditions that occur during program execution and write robust and reliable code.