Скачать или смотреть Adding and Writing Code on Button using Visual Studio 2019

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Button_Tutorial
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
button1.BackColor = Color.Green;
button2.BackColor = Color.White;
}

private void button2_Click(object sender, EventArgs e)
{
button2.BackColor = Color.Red;
button1.BackColor = Color.White;
}

private void button1_MouseHover(object sender, EventArgs e)
{
button1.BackColor = Color.Pink;

}

private void button1_MouseLeave(object sender, EventArgs e)
{
button1.BackColor = Color.White;
}

private void button2_MouseHover(object sender, EventArgs e)
{
button2.BackColor = Color.Pink;
}

private void button2_MouseLeave(object sender, EventArgs e)
{
button2.BackColor = Color.White;
}
}
}