Expert to C# Help Me!

Question

I am learning about the programming language C #. to the use of unsafe code and pointers in C #.
and this is all my code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {

            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
        struct Location
        {
            public int X;
            public int Y;
        }
        unsafe static void Main(string[] args)
        {

            Location loc;

            loc.X = 100;

            loc.Y = 100;

            Location* loc_ptr;

            loc_ptr = &loc;

            Console.WriteLine("X = {0}", loc_ptr->X);

            loc_ptr->X = 200;

            Console.WriteLine("X = {0}", loc_ptr->X);

        }
    }
}
the code is in error as follows:
unsafe code may only appear if compiling with/unsafe
// I tried and then move consoleapplication but it failed. and error is so
//Hope the experts help answer helped me

Chung Le Kha · Answer

Yes! I very Like to answer your! :D

Kirtan Patel · Answer

Hey Friend if my answer Helped you to resolve problem then check  Do you like this answer  @ my post :)

Chung Le Kha · Answer

Thank you so much! I solved my problem! I was a more obstacles: if in the code above we use the pointer that will modify the code like?

Sam Hobbs · Answer

Yes of course a form can be used in a console project but if a form is not needed then the form just makes things confusing for a beginner. I think it helps a beginner better to explain the difference and teach them how to do it the most appropriate way.

Roei Bar · Answer

my friend marking the project as Unsafe will make you incharge of everything regarding memory management and memory allocation. about using the project as console and actually being in WinForm this is not an issue you can use Winform with Console its even easier to debug this way

Sam Hobbs · Answer

I think the code: Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); Application.Run(new Form1()); is for form applications and I think the project is supposed to be a Console project. I am sorry for the messed up formatting of the code but I am sure you know that this web site's code is not good.

Sam Hobbs · Answer

I see a couple of problems. One problem is that you have two Main functions. Another problem is that you seem to want a Console application but your project is a Forms application. Do you know the difference between the two types of projects? Do you know which type you want? I think you need to rename or delete the existing project then create a new Console project. Then put your code in the Main function that is in the generated code. Be sure to keep a copy of the code if necessary.

Kirtan Patel · Answer

Friend  Here is Solution of Your Problem :) dont forget to mark  Do you like this answer  it my answer Help you :) Here are your mistake ..i found in programs I Corrected The Code :) 1. you have used Main() Method two times in Program Here is corrected Code namespace WindowsFormsApplication2 { static class Program { /// /// The main entry point for the application. /// struct Location { public int X; public int Y; } [ STAThread ] unsafe static void Main( string [] args) { Application .EnableVisualStyles(); Application .SetCompatibleTextRenderingDefault( false ); Application .Run( new Form1 ()); Location loc; loc.X = 100; loc.Y = 100; Location * loc_ptr; loc_ptr = &loc; Console .WriteLine( X = {0}  loc_ptr->X); loc_ptr->X = 200; Console .WriteLine( X = {0}  loc_ptr->X); } } } 2. Second Error( Unsafe code may only appear if compiling with /unsafe ) Can Be resolved By Following Way :) Go To Project Menu >> Properties>>Build >> Check Allow Unsafe Code Check Box To Solve it :)