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Exception Handling in C#

Exception Handling in C#:-


It is used to handle unexpected run time errors of the program to protect the program from run time interruption.

C# provides a try and catch block to handle the exception, try block is used to write the program code, ana d catch block is used to handle the error message.


Type of exception block:-

1)  try-catch block


  try
     {
               CODE SECTION;

    }
   catch()
  {
          ERROR SECTION;

  }

2) try---catch---finally block

try
{
    program code

}
catch(Exception ex)
{
   error message;
}
finally
{
Default Exception Block means it will execute under try and catch both.
}

Example of Division Program to Handle Exception in C#:-

 class ExceptionDemo
    {
        static void Main()
        {
            int a, b, c;
            try
            {
                Console.WriteLine("Enter First Number");
                a = int.Parse(Console.ReadLine());
                Console.WriteLine("Enter Second Number");
                b = int.Parse(Console.ReadLine());
                c = a / b;
                Console.WriteLine("Result is {0}", c);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message.ToString());
            }
            Console.ReadKey();

        }
    }

Example of Exception handling using multiple catch block:-

  class ExceptionDemo
    {
        static void Main()
        {
            int a, b, c;
            try
            {
                Console.WriteLine("Enter First Number");
                a = int.Parse(Console.ReadLine());
                Console.WriteLine("Enter Second Number");
                b = int.Parse(Console.ReadLine());
                c = a / b;
                Console.WriteLine("Result is {0}", c);
            }
            catch (FormatException ex)
            {
                Console.WriteLine("Enter Numeric Value");
            }
            catch (DivideByZeroException ex)
            {
                Console.WriteLine("Denominator Can Not Be Zero");
            }
            Console.ReadKey();

        }
    }



Example of Try-catch and default block in c#:-

class ExceptionDemo
    {
        static void Main()
        {
            int a, b, c;
            try
            {
                Console.WriteLine("Enter First Number");
                a = int.Parse(Console.ReadLine());
                Console.WriteLine("Enter Second Number");
                b = int.Parse(Console.ReadLine());
                c = a / b;
                Console.WriteLine("Result is {0}", c);
            }
            catch (FormatException ex)
            {
                Console.WriteLine("Enter Numeric Value");
            }
            catch (DivideByZeroException ex)
            {
                Console.WriteLine("Denominator Can Not Be Zero");
            }
            finally
            {
                Console.WriteLine("Default Block");
            }
            Console.ReadKey();

        }
    }


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication5
{
    class ExceptionDemo
    {
        int c;
        void Division(int a, int b)
        {
            try
            {
                c = a / b;
                Console.WriteLine(c);
            }
            catch (ArithmeticException ex)
            {
                Console.WriteLine(ex.Message.ToString());
            }
        }

        static void Main()
        {
            ExceptionDemo obj = new ExceptionDemo();
            obj.Division(100, 0);
            Console.ReadKey();
        }


    }
}



Throw Keyword in C#:-

It is used to call exceptions class manually.

int a=0;
if\(a<0):
    throw new Exception();



Example of throw keyword:-

class ExceptionExample
    {
        static void Main()
        {
            int a=-100;
            try
            {
                if (a < 0)
                {
                    throw new DivideByZeroException();
                }
                Console.WriteLine(a);
            }
            catch (DivideByZeroException ex)
            {
                Console.WriteLine("Enter only positive data");
            }

            Console.ReadKey();
        }
    }






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