exception C# code example

Example 1: c# throw new exception

static void CopyObject(SampleClass original)
{
    if (original == null)
    {
        throw new System.ArgumentException("Parameter cannot be null", "original");
    }
}

Example 2: exception handling c#

try {
   // statements causing exception
} catch( ExceptionName e1 ) {
   // error handling code
} catch( ExceptionName e2 ) {
   // error handling code
} catch( ExceptionName eN ) {
   // error handling code
} finally {
   // statements to be executed
}

Example 3: exception in asp.net c#

class Program
{
    static void Main(string[] args)
    {
        try
        {
            Console.WriteLine("Enter a number: ");

            var num = int.parse(Console.ReadLine());

            Console.WriteLine($"Squre of {num} is {num * num}");
        }
        catch(Exception ex)
        {
            Console.Write("Error info:" + ex.Message);
        }
        finally
        {
            Console.Write("Re-try with a different number.");
        }
    }
}

Example 4: exception in asp.net c#

try
{
    //code that may raise an exception
}
catch
{ 
    // this catch block must be last block
}
catch (NullReferenceException nullEx)
{
    Console.WriteLine(nullEx.Message);
}
catch (InvalidCastException inEx)
{
    Console.WriteLine(inEx.Message);
}

Example 5: exception in asp.net c#

class Program
{
    static void Main(string[] args)
    {
        try
        {
            Console.WriteLine("Enter a number: ");

            var num = int.parse(Console.ReadLine());

            Console.WriteLine($"Squre of {num} is {num * num}");
        }
        catch
        {
            Console.Write("Error occurred.");
        }
        finally
        {
            Console.Write("Re-try with a different number.");
        }
    }
}

Example 6: exception in asp.net c#

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine("Enter a number: ");

        var num = int.Parse(Console.ReadLine());

        Console.WriteLine($"Squre of {num} is {num * num}");
    }
}