Visual C++ fatal error LNK1120: 1 unresolved externals - c++-cli

Question

Every time i try to run this program it gives me an error: EDITED
fatal error LNK1120: 1 unresolved externals
and another error
LNK2001: unresolved external symbol _main
EDITED
Ui.h:
#pragma once
namespace Spammer2 {
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 Ui
/// </summary>
public ref class Ui : public System::Windows::Forms::Form
{
public:
Ui(void)
{
InitializeComponent();
//
//TODO: Add the constructor code here
//
}
protected:
/// <summary>
/// Clean up any resources being used.
/// </summary>
~Ui()
{
if (components)
{
delete components;
}
}
private: System::Windows::Forms::TextBox^ textBox1;
protected:
private: System::Windows::Forms::Button^ button1;
private: System::Windows::Forms::Button^ button2;
private: System::Windows::Forms::TextBox^ textBox2;
private: System::Windows::Forms::Label^ label1;
private: System::Windows::Forms::Timer^ timer1;
private: System::ComponentModel::IContainer^ components;
private:
/// <summary>
/// Required designer variable.
/// </summary>
#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->components = (gcnew System::ComponentModel::Container());
this->textBox1 = (gcnew System::Windows::Forms::TextBox());
this->button1 = (gcnew System::Windows::Forms::Button());
this->button2 = (gcnew System::Windows::Forms::Button());
this->textBox2 = (gcnew System::Windows::Forms::TextBox());
this->label1 = (gcnew System::Windows::Forms::Label());
this->timer1 = (gcnew System::Windows::Forms::Timer(this->components));
this->SuspendLayout();
//
// textBox1
//
this->textBox1->Location = System::Drawing::Point(12, 13);
this->textBox1->Name = L"textBox1";
this->textBox1->Size = System::Drawing::Size(260, 20);
this->textBox1->TabIndex = 0;
this->textBox1->TextChanged += gcnew System::EventHandler(this, &Ui::textBox1_TextChanged);
//
// button1
//
this->button1->Location = System::Drawing::Point(12, 138);
this->button1->Name = L"button1";
this->button1->Size = System::Drawing::Size(75, 23);
this->button1->TabIndex = 1;
this->button1->Text = L"Start";
this->button1->UseVisualStyleBackColor = true;
this->button1->Click += gcnew System::EventHandler(this, &Ui::button1_Click);
//
// button2
//
this->button2->Location = System::Drawing::Point(196, 138);
this->button2->Name = L"button2";
this->button2->Size = System::Drawing::Size(75, 23);
this->button2->TabIndex = 2;
this->button2->Text = L"Stop";
this->button2->UseVisualStyleBackColor = true;
this->button2->Click += gcnew System::EventHandler(this, &Ui::button2_Click);
//
// textBox2
//
this->textBox2->Location = System::Drawing::Point(172, 112);
this->textBox2->Name = L"textBox2";
this->textBox2->Size = System::Drawing::Size(100, 20);
this->textBox2->TabIndex = 3;
this->textBox2->Text = L"100";
this->textBox2->TextChanged += gcnew System::EventHandler(this, &Ui::textBox2_TextChanged);
//
// label1
//
this->label1->AutoSize = true;
this->label1->Location = System::Drawing::Point(62, 115);
this->label1->Name = L"label1";
this->label1->Size = System::Drawing::Size(104, 13);
this->label1->TabIndex = 4;
this->label1->Text = L"Interval milliseconds:";
this->label1->Click += gcnew System::EventHandler(this, &Ui::label1_Click);
//
// timer1
//
this->timer1->Tick += gcnew System::EventHandler(this, &Ui::timer1_Tick);
//
// Ui
//
this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
this->ClientSize = System::Drawing::Size(284, 173);
this->Controls->Add(this->label1);
this->Controls->Add(this->textBox2);
this->Controls->Add(this->button2);
this->Controls->Add(this->button1);
this->Controls->Add(this->textBox1);
this->Name = L"Ui";
this->Text = L"Spammereme V2";
this->ResumeLayout(false);
this->PerformLayout();
}
#pragma endregion
private: System::Void textBox1_TextChanged(System::Object^ sender, System::EventArgs^ e) {
}
private: System::Void button1_Click(System::Object^ sender, System::EventArgs^ e) {
timer1->Start();
}
private: System::Void button2_Click(System::Object^ sender, System::EventArgs^ e) {
timer1->Stop();
}
private: System::Void textBox2_TextChanged(System::Object^ sender, System::EventArgs^ e) {
}
private: System::Void label1_Click(System::Object^ sender, System::EventArgs^ e) {
}
private: System::Void timer1_Tick(System::Object^ sender, System::EventArgs^ e) {
timer1->Interval = System::Int32::Parse(textBox2->Text);
SendKeys::Send(textBox1->Text);
SendKeys::Send("{ENTER}");
}
}
};
Ui.cpp:
#include "StdAfx.h"
#include "Ui.h"

Answer 1

The compiler error will say the line number for the question you originally asked.
However, it looks like you have
namespace Spammer2 {
//lots of usings
public ref class Ui : public System::Windows::Forms::Form
{
//lots of other stuff
}
};
You need to end the class definition with a semicolon, not the namespace:
namespace Spammer2 {
//lots of usings
public ref class Ui : public System::Windows::Forms::Form
{
//lots of other stuff
}; //<-------
} //<-------
Edit:
Since the question has now changed, if this is all your code add a main to UI.cpp
#include "StdAfx.h"
#include "Ui.h"
int main()
{
}