1）在窗體上佈置控制元件：1個TextBox，1個Button和1 個ColorDialog

2）Form1.cs

using System;

using System.Windows.Forms;

namespace WindowsFormsApplication1

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void button1_Click(object sender, EventArgs e)

{

if (colorDialog1.ShowDialog() == DialogResult.OK)

{

textBox1.BackColor = colorDialog1.Color;

}

}

}

}