C sharp Exceptions

Exception handling is an in built mechanism in .NET framework to detect and handle runtime errors. The .NET framework contains lots of standard exceptions.

The exceptions are anomalies that occur during the execution of a program.

"Exception is a runtime error which arises because of abnormal conditions in a condition in a sequence."

C# provides three keywords try, catch and finally to do exception handling. The try encloses the statements that might throw an exception whereas catch handles exception if one exists. The finally can be used for doing any clean up process.

The general form of try-catch-finally in c# is shown below:

try
{
    // Statements which can cause an exception
}
catch(Type x)
{
    // Statements for handling the exception
}
finally
{
    // Any Cleanup Code
}

Example of Exception Handling:

using System;
namespace ConsoleApplication1
{
    class main
    {
        public static void Main()
        {
            int[] a = new int[5];
            int i;
            try
            {
                for (i = 0; i < 7; i++)
                {
                    a[i] = Convert.ToInt32(Console.ReadLine());
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("Please Check The Error Limits...");
            }
            for (i = 0; i < 5; i++)
            {
                Console.WriteLine("Array Element Is " + a[i]);
            }
        }
    }
}

2 Replies

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Sinu Joseph13y ago
Exception handling is an in built mechanism in .NET framework to detect and handle runtime errors. The .NET framework contains lots of standard exceptions.

The exceptions are anomalies that occur during the execution of a program.

"Exception is a runtime error which arises because of abnormal conditions in a condition in a sequence."

C# provides three keywords try, catch and finally to do exception handling. The try encloses the statements that might throw an exception whereas catch handles exception if one exists. The finally can be used for doing any clean up process.

The general form of try-catch-finally in c# is shown below:

try
{
    // Statements which can cause an exception
}
catch(Type x)
{
    // Statements for handling the exception
}
finally
{
    // Any Cleanup Code
}

Example of Exception Handling:

using System;
namespace ConsoleApplication1
{
    class main
    {
        public static void Main()
        {
            int[] a = new int[5];
            int i;
            try
            {
                for (i = 0; i < 7; i++)
                {
                    a[i] = Convert.ToInt32(Console.ReadLine());
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("Please Check The Error Limits...");
            }
            for (i = 0; i < 5; i++)
            {
                Console.WriteLine("Array Element Is " + a[i]);
            }
        }
    }
}
Vulpes13y ago
It's only necessary to specify an exception variable in a catch block if:

1. You want to access one of its properties (Message, StackTrace, InnerException etc); or

2. You want to re-throw the exception so that it be caught by an earlier try/catch block.