C# 每点击一次按钮 出现一行文字(用到类)

Question

具体用到类 就是每点击一次按钮文本框里出现一行字  每点一次增加一行 内容是一样的
有好心的大侠 可以指点下我吗? 

Answer 1

void button1_Click(object Sender, EventArgs e)
{
    textBox.Text += "\r\nHello World!";
}

Answer 2

Designer.csnamespace WindowsFormsApplication1
{
    partial class Form1
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }        #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>
        private void InitializeComponent()
        {
            this.richTextBox1 = new System.Windows.Forms.RichTextBox();
            this.button1 = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // richTextBox1
            // 
            this.richTextBox1.Location = new System.Drawing.Point(106, 42);
            this.richTextBox1.Name = "richTextBox1";
            this.richTextBox1.Size = new System.Drawing.Size(326, 190);
            this.richTextBox1.TabIndex = 0;
            this.richTextBox1.Text = "";
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(218, 295);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 23);
            this.button1.TabIndex = 1;
            this.button1.Text = "button1";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(610, 430);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.richTextBox1);
            this.Name = "Form1";
            this.Text = "Form1";
            this.ResumeLayout(false);        }        #endregion        private System.Windows.Forms.RichTextBox richTextBox1;
        private System.Windows.Forms.Button button1;    }
}-------------------------------------------------------------
Form.csusing System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        int times = 0;        public Form1()
        {
            InitializeComponent();
           
        }        private void button1_Click(object sender, EventArgs e)
        {
            if (times == 0)
            {
                richTextBox1.Text = "hello,world";
                times++;
            }
            else
            {
                richTextBox1.Text += "\r\nhello,world";
            }
        }            }    
}

Answer 3

void button1_Click(object Sender, EventArgs e)
{
  textBox.Text += "\r\nHello World!";
}