LINK : fatal error LNK1561: entry point must be defined

Question

So I'm using Visual Basic C++ 2010 to right my Visual Hello World project for school. I've gotten the code written but I keep getting 'LINK : fatal error LNK1561: entry point must be defined'.

I've looked under

Properties -> Linker -> System >

for the Configuration and it's blank. This is my code. Can you point it out on where I need to define my entry point?

    #pragma once

namespace Visual_Hello_World {

using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;

/// <summary>
/// Summary for HelloWorld
/// </summary>
public ref class HelloWorld : public System::Windows::Forms::Form
{
public:
    HelloWorld(void)
    {
        InitializeComponent();
        //
        //TODO: Add the constructor code here
        //
    }

protected:
    /// <summary>
    /// Clean up any resources being used.
    /// </summary>
    ~HelloWorld()
    {
        if (components)
        {
            delete components;
        }
    }
private: System::Windows::Forms::Button^  button1;
protected: 
private: System::Windows::Forms::Label^  label1;
private: System::Windows::Forms::Label^  label2;

private:
    /// <summary>
    /// Required designer variable.
    /// </summary>
    System::ComponentModel::Container ^components;

#pragma region Windows Form Designer generated code
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    void InitializeComponent(void)
    {
        this->button1 = (gcnew System::Windows::Forms::Button());
        this->label1 = (gcnew System::Windows::Forms::Label());
        this->label2 = (gcnew System::Windows::Forms::Label());
        this->SuspendLayout();
        // 
        // button1
        // 
        this->button1->Font = (gcnew System::Drawing::Font(L"Modern No. 20", 20.25F, System::Drawing::FontStyle::Regular, System::Drawing::GraphicsUnit::Point, 
            static_cast<System::Byte>(0)));
        this->button1->Location = System::Drawing::Point(56, 105);
        this->button1->Name = L"button1";
        this->button1->Size = System::Drawing::Size(166, 44);
        this->button1->TabIndex = 0;
        this->button1->Text = L"&Click Me!";
        this->button1->UseVisualStyleBackColor = true;
        this->button1->Click += gcnew System::EventHandler(this, &HelloWorld::button1_Click);
        // 
        // label1
        // 
        this->label1->AutoSize = true;
        this->label1->Font = (gcnew System::Drawing::Font(L"Modern No. 20", 26.25F, System::Drawing::FontStyle::Regular, System::Drawing::GraphicsUnit::Point, 
            static_cast<System::Byte>(0)));
        this->label1->Location = System::Drawing::Point(38, 31);
        this->label1->Name = L"label1";
        this->label1->Size = System::Drawing::Size(204, 36);
        this->label1->TabIndex = 1;
        this->label1->Text = L"Hello World!";
        // 
        // label2
        // 
        this->label2->AutoSize = true;
        this->label2->Font = (gcnew System::Drawing::Font(L"Modern No. 20", 21.75F, System::Drawing::FontStyle::Regular, System::Drawing::GraphicsUnit::Point, 
            static_cast<System::Byte>(0)));
        this->label2->Location = System::Drawing::Point(50, 181);
        this->label2->Name = L"label2";
        this->label2->Size = System::Drawing::Size(184, 31);
        this->label2->TabIndex = 2;
        this->label2->Text = L"For a surprise!";
        // 
        // HelloWorld
        // 
        this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
        this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
        this->ClientSize = System::Drawing::Size(284, 262);
        this->Controls->Add(this->label2);
        this->Controls->Add(this->label1);
        this->Controls->Add(this->button1);
        this->Name = L"HelloWorld";
        this->Text = L"HelloWorld";
        this->Load += gcnew System::EventHandler(this, &HelloWorld::HelloWorld_Load);
        this->ResumeLayout(false);
        this->PerformLayout();

    }
#pragma endregion
private: System::Void HelloWorld_Load(System::Object^  sender, System::EventArgs^  e) {
         }
private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {

             MessageBox::Show ("Fun Fact: the Pharaoh Tutankhamun died when he was 19 years old after a severe infection set in his leg, which was wounded in battle. King Tut's leg was crushed, resulting in him having to walk around with a cane. King Tut has the largest collection of canes to date.");
         }
};

}

Answer 1

I figured out what was wrong; I was using a CLR Console Application instead of a Windows Form Application.

For future reference for anyone else who takes C++ Programming using Microsoft Visual 2010 Express; make sure that you are using the correct format. Otherwise, the program will not work.

Thanks to everyone who wrote helpful answers!

Answer 2

//for CLR windows form on MyForm.cpp use:
#include "MyForm.h"

using namespace System;
using namespace System::Windows::Forms;

[STAThreadAttribute]
    void Main(array<String^>^ args) {
    Application::EnableVisualStyles();
    Application::SetCompatibleTextRenderingDefault(false);
    //WinformCDemo is your project name
    WinformCDemo::MyForm1 form;
    Application::Run(%form);
}

// under Configuration Properties/Linker/Advanced/entry point set it to Main.
// under Configuration Properites/Linker/System/SubSystem   set it to Windows 
(/SUBSYSTEM:WINDOWS)