C# WinForm RichTextBox text dynamic scrolling display text

When RichTextBox dynamically displays some text information, some settings are required to display the current string to be displayed.

A RichTextBox, a button. The following figure shows the display process at runtime.

Form1.cs:

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

namespace RichTextBoxScroll
{
    public partial class Form1 : Form
    {
        private delegate void delInfoList(string text);
        public Form1()
        {
            InitializeComponent();
        }
        
        private void SetrichTextBox(string value)
        {

            if (richTextBox1.InvokeRequired)//Other thread calls
            {
                delInfoList d = new delInfoList(SetrichTextBox);
                richTextBox1.Invoke(d, value);
            }
            else//This thread calls
            {
                if (richTextBox1.Lines.Length > 100)
                {
                    richTextBox1.Clear();
                }

                richTextBox1.Focus(); //Let the text box get the focus
                richTextBox1.Select(richTextBox1.TextLength, 0);//Set the cursor position to the end of the text
                richTextBox1.ScrollToCaret();//Scroll to the control cursor
                richTextBox1.AppendText(value);//Add content
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            for (int i = 0; i < 300; i++)
            {
                SetrichTextBox(DateTime.Now.ToString() + "The content is scrolling and printing!!!\n");
            }
        }
    }
}

Form1.Designer.cs:

namespace RichTextBoxScroll
{
    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.panel1 = new System.Windows.Forms.Panel();
            this.button1 = new System.Windows.Forms.Button();
            this.richTextBox1 = new System.Windows.Forms.RichTextBox();
            this.panel1.SuspendLayout();
            this.SuspendLayout();
            //
            // panel1
            //
            this.panel1.Controls.Add(this.button1);
            this.panel1.Controls.Add(this.richTextBox1);
            this.panel1.Dock = System.Windows.Forms.DockStyle.Fill;
            this.panel1.Location = new System.Drawing.Point(0, 0);
            this.panel1.Name = "panel1";
            this.panel1.Size = new System.Drawing.Size(706, 496);
            this.panel1.TabIndex = 0;
            //
            // button1
            //
            this.button1.Location = new System.Drawing.Point(609, 85);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 23);
            this.button1.TabIndex = 1;
            this.button1.Text = "Start Test";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            //
            // richTextBox1
            //
            this.richTextBox1.Dock = System.Windows.Forms.DockStyle.Fill;
            this.richTextBox1.Font = new System.Drawing.Font("SimSun", 21.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
            this.richTextBox1.Location = new System.Drawing.Point(0, 0);
            this.richTextBox1.Name = "richTextBox1";
            this.richTextBox1.Size = new System.Drawing.Size(706, 496);
            this.richTextBox1.TabIndex = 0;
            this.richTextBox1.Text = "";
            //
            // Form1
            //
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(706, 496);
            this.Controls.Add(this.panel1);
            this.Name = "Form1";
            this.Text = "Scroll Printing Test";
            this.panel1.ResumeLayout(false);
            this.ResumeLayout(false);


        }


        #endregion


        private System.Windows.Forms.Panel panel1;
        private System.Windows.Forms.RichTextBox richTextBox1;
        private System.Windows.Forms.Button button1;
    }
}