interview question at levin soft

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1.00/5 (3 votes)

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C#

ASP.NET

hi friends

does main() method has public access modifier always?

Posted 30-Jul-11 6:38am

AZADKUMARREDDY

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Sergey Alexandrovich Kryukov · Answer 1 · 2011-08-01T20:08:00

Entry point (usually Main) should not be public. Actually, it should better be private and it is always created by Visual Studio as private. The access modifier is not written, it is public by default.

This fact is easy to check up by adding access modifier "private" explicitly — it does work.

Now, I want to explain why explanation my Manas is wrong: Main can perfectly be accessed by the Framework. In fact, access specifiers do not prevent Reflection to access types and members. This is easy to check up using BindingFlags.

—SA

Mohammad A Rahman · Answer 2 · 2011-08-02T00:34:00

Let's do a small experiment,

Step 1: Write a small program with following contents,

C#

namespace MainMethodTester
{
    using System;
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Main Method Tester");
        }
    }
}

Step 2: Build the solution.

Step 3: Open .Net Reflector program (I assume you have the program or otherwise, .Net Reflector[^]) and drag and drop the builded exe file(from the debug folder) in side the .Net Reflector program.

Step 4: Then Open the Main Method from the .Net Reflector window and you will see following code for the Main method,

C#

private static void Main(string[] args)
{
    Console.WriteLine("Main Method Tester");
}

in where Main is private BY DEFAULT.

Hope it helps :)

Manas Bhardwaj · Answer 3 · 2011-07-30T06:45:00

Solution 1

Yes. Main has to have public access modifier.Reason being that Main is considered as the entry point of the application.It can be called within an assembly or even from different assembly.So how can another assembly can call a Main method that is not public.

More on MSDN :

http://msdn.microsoft.com/en-us/library/acy3edy3(v=vs.80).aspx[^]

Posted 30-Jul-11 6:45am

Manas Bhardwaj

Comments

walterhevedeich 30-Jul-11 12:49pm

Deserves a 5. I was going to post the same link but was confused on the tags on OP's question. I would like to add that ASP.Net has a different notion with applications that has Main method as an entry point.

Manas Bhardwaj 30-Jul-11 12:51pm

Thanks! Agree about your ASP.Net comment.

AZADKUMARREDDY 31-Jul-11 9:00am

thanks for ur answer

Sergey Alexandrovich Kryukov 2-Aug-11 2:12am

What happened? Unfortunately, you're wrong, as well as Manas. Please see my solution and comments. You can easily check up to make sure my answer is correct.
--SA

Sergey Alexandrovich Kryukov 2-Aug-11 2:11am

Manas, what happened to you? Probably, it was not your day. It's easily to check up that your answer is... well, opposite to true. Please check up. Even your reference shows that Main is private. Look by yourself.

You explanation of why public access is needed is also wrong. I always access private members via Reflection. It is specifically documented that access modifiers do not provide any security.

Please see my answer where I explain things.

I did not vote. I suggest you remove this answer.
--SA

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