添加panel的背景色，急！

[daijiedaimin]

按下button弹出一个对话框，可输汉字，若输入“黑色”，在richtextbox中显示汉字“黑色”，同时panel背景颜色变为黑色，该如何写代码？

[terry52]

Form1 代码：
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace DemoButton
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Panel panel1;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.TextBox textBox1;
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;

public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();

//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}

/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.panel1 = new System.Windows.Forms.Panel();
this.label1 = new System.Windows.Forms.Label();
this.button1 = new System.Windows.Forms.Button();
this.textBox1 = new System.Windows.Forms.TextBox();
this.panel1.SuspendLayout();
this.SuspendLayout();
//
// panel1
//
this.panel1.Controls.Add(this.label1);
this.panel1.Location = new System.Drawing.Point(8, 32);
this.panel1.Name = "panel1";
this.panel1.Size = new System.Drawing.Size(192, 100);
this.panel1.TabIndex = 0;
//
// label1
//
this.label1.AutoSize = true;
this.label1.ForeColor = System.Drawing.Color.Red;
this.label1.Location = new System.Drawing.Point(72, 32);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(35, 17);
this.label1.TabIndex = 0;
this.label1.Text = "Panel";
//
// button1
//
this.button1.Location = new System.Drawing.Point(168, 176);
this.button1.Name = "button1";
this.button1.TabIndex = 1;
this.button1.Text = "button1";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(240, 40);
this.textBox1.Multiline = true;
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(104, 80);
this.textBox1.TabIndex = 2;
this.textBox1.Text = "textBox1";
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(408, 253);
this.Controls.Add(this.textBox1);
this.Controls.Add(this.button1);
this.Controls.Add(this.panel1);
this.Name = "Form1";
this.Text = "Form1";
this.panel1.ResumeLayout(false);
this.ResumeLayout(false);

}
#endregion

/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}

private void button1_Click(object sender, System.EventArgs e) {
Form2 form2 = new Form2(this.panel1, this.textBox1);
form2.ShowDialog();
}
}
}

Form2 代码：
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;

namespace DemoButton
{
/// <summary>
/// Form2 的摘要说明。
/// </summary>
public class Form2 : System.Windows.Forms.Form
{
private System.Windows.Forms.TextBox textBox1;
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;
private Control Ctl1;
private Control Ctl2;

public Form2()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();

//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}

public Form2 (Control ctl1, Control ctl2) {
InitializeComponent();
Ctl1 = ctl1;
Ctl2 = ctl2;
}

/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if(components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.textBox1 = new System.Windows.Forms.TextBox();
this.SuspendLayout();
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(80, 64);
this.textBox1.Name = "textBox1";
this.textBox1.TabIndex = 0;
this.textBox1.Text = "textBox1";
this.textBox1.TextChanged += new System.EventHandler(this.textBox1_TextChanged);
//
// Form2
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(288, 189);
this.Controls.Add(this.textBox1);
this.Name = "Form2";
this.Text = "Form2";
this.ResumeLayout(false);

}
#endregion

private void textBox1_TextChanged(object sender, System.EventArgs e) {
if (this.textBox1.Text.Trim() == "黑色") {
Ctl1.BackColor = System.Drawing.Color.Black;
Ctl2.Text = "黑色";
}
}
}
}

[灰太狼]

用枚举。