Try-catch execution flow in C Sharp (C#)

Introduction

Try-catch helps your program handle errors without crashing. It lets you catch problems and decide what to do next.

When reading a file that might not exist.

When dividing numbers and the divisor could be zero.

When connecting to the internet and the connection might fail.

When converting user input to a number that might be invalid.

Syntax

C Sharp (C#)

try
{
    // code that might cause an error
}
catch (Exception e)
{
    // code to handle the error
}

The try block contains code that might cause an error.

The catch block runs only if an error happens in the try block.

Examples

This catches a divide by zero error and prints a message.

C Sharp (C#)

try
{
    int x = 10 / 0;
}
catch (DivideByZeroException e)
{
    Console.WriteLine("Cannot divide by zero.");
}

This catches an error when trying to use a null object.

C Sharp (C#)

try
{
    string s = null;
    Console.WriteLine(s.Length);
}
catch (NullReferenceException e)
{
    Console.WriteLine("Object was null.");
}

Sample Program

This program tries to divide 5 by 0, which causes an error. The catch block catches it and prints a friendly message. The program then continues to run.

C Sharp (C#)

using System;

class Program
{
    static void Main()
    {
        try
        {
            Console.WriteLine("Start");
            int a = 5;
            int b = 0;
            int c = a / b;  // This causes an error
            Console.WriteLine("Result: " + c);
        }
        catch (DivideByZeroException)
        {
            Console.WriteLine("Oops! You tried to divide by zero.");
        }
        Console.WriteLine("End");
    }
}

Important Notes

If no error happens, the catch block is skipped.

You can have multiple catch blocks for different error types.

Use try-catch to keep your program running smoothly even when errors happen.

Summary

Try-catch lets you handle errors without stopping your program.

Code inside try runs first; if an error happens, catch runs.

This helps make your programs more reliable and user-friendly.