C# จะเรียกใช้ method ในโค้ด ขณะ รันโปรแกรมยังไง ครับ

 private void button1_Click(object sender, EventArgs e)
        {
              Test_1();
        }

 private void button1_Click(object sender, EventArgs e)
        {
             frmHtmlAgilityPack p = new frmHtmlAgilityPack();
             Type t = p.GetType();
             MethodInfo mi = t.GetMethod(textBox1.Text, BindingFlags.NonPublic | BindingFlags.Instance);
             mi.Invoke(p, null);
    
        }

MessageBox.Show(HttpUtility.HtmlDecode(strFormLabel));

if (textBox1.Text == "Test_1") {
  Test_1();
} else if  (textBox1.Text == "Test_N") {
  Test_N();
} else {
  MessageBox.Show("ไม่มีเมธอดนี้ในคลาส!");
}

// หรือ

switch(textBox1.Text) 
{
  case "Test_1":
    Test_1();
    break;
  case "Test_N":
    Test_N();
    break;
  default:
    MessageBox.Show("ไม่มีเมธอดนี้ในคลาส!");
    break;
}

class x
{
  internal void Test_1()
  {
    // ...method code...
  }
}

private void button1_Click(object sender, EventArgs e)
       {
            frmHtmlAgilityPack p = new frmHtmlAgilityPack();
            Type t = p.GetType();
            MethodInfo mi = t.GetMethod(textBox1.Text);
            mi.Invoke(p, null);
       }

class x
{
  public void Test_1()
  {
    // ...method code...
  }
}

 MessageBox.Show(HttpUtility.HtmlDecode(strFormLabel));

  richTextBox1.WriteLine(btest);
  richTextBox1.WriteLine(HttpUtility.HtmlDecode(strFormLabel));

MessageBox.Show(HttpUtility.HtmlDecode(strFormLabel)); 

x y = new x();
eval("y." + "MethodName" + "();"); // สามารถเรียกเมธอดด้วย string ได้

namespace dotnetfiddle
{
    partial class frmHtmlAgilityPack
    {
        /// <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.panel1 = new System.Windows.Forms.Panel();
            this.button1 = new System.Windows.Forms.Button();
            this.textBox1 = new System.Windows.Forms.TextBox();
            this.panel1.SuspendLayout();
            this.SuspendLayout();
            // 
            // richTextBox1
            // 
            this.richTextBox1.Dock = System.Windows.Forms.DockStyle.Fill;
            this.richTextBox1.Location = new System.Drawing.Point(0, 62);
            this.richTextBox1.Margin = new System.Windows.Forms.Padding(4, 4, 4, 4);
            this.richTextBox1.Name = "richTextBox1";
            this.richTextBox1.Size = new System.Drawing.Size(687, 242);
            this.richTextBox1.TabIndex = 0;
            this.richTextBox1.Text = "";
            // 
            // panel1
            // 
            this.panel1.Controls.Add(this.button1);
            this.panel1.Controls.Add(this.textBox1);
            this.panel1.Dock = System.Windows.Forms.DockStyle.Top;
            this.panel1.Location = new System.Drawing.Point(0, 0);
            this.panel1.Margin = new System.Windows.Forms.Padding(4, 4, 4, 4);
            this.panel1.Name = "panel1";
            this.panel1.Size = new System.Drawing.Size(687, 62);
            this.panel1.TabIndex = 1;
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(451, 16);
            this.button1.Margin = new System.Windows.Forms.Padding(4, 4, 4, 4);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(100, 28);
            this.button1.TabIndex = 1;
            this.button1.Text = "Run";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // textBox1
            // 
            this.textBox1.Location = new System.Drawing.Point(17, 16);
            this.textBox1.Margin = new System.Windows.Forms.Padding(4, 4, 4, 4);
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(407, 22);
            this.textBox1.TabIndex = 0;
            // 
            // frmHtmlAgilityPack
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(8F, 16F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(687, 304);
            this.Controls.Add(this.richTextBox1);
            this.Controls.Add(this.panel1);
            this.Margin = new System.Windows.Forms.Padding(4, 4, 4, 4);
            this.Name = "frmHtmlAgilityPack";
            this.Text = "frmHtmlAgilityPack";
            this.Load += new System.EventHandler(this.frmHtmlAgilityPack_Load);
            this.panel1.ResumeLayout(false);
            this.panel1.PerformLayout();
            this.ResumeLayout(false);

        }

        #endregion
        private System.Windows.Forms.Panel panel1;
        public System.Windows.Forms.RichTextBox richTextBox1;
        public System.Windows.Forms.Button button1;
        public System.Windows.Forms.TextBox textBox1;
    }
}

using HtmlAgilityPack;
using System;
using System.Reflection;
using System.Text.RegularExpressions;
using System.Web;
using System.Windows.Forms;

namespace dotnetfiddle
{
    public partial class frmHtmlAgilityPack : Form
    {
        public frmHtmlAgilityPack()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            frmHtmlAgilityPack p = new frmHtmlAgilityPack();

            richTextBox1.AppendText((GetType() == typeof(frmHtmlAgilityPack)).ToString());
            Type t = GetType();

            MethodInfo mi = t.GetMethod(textBox1.Text, BindingFlags.NonPublic | BindingFlags.Instance);
            mi.Invoke(p, new object[] {richTextBox1});
        }
        void Test_1(RichTextBox rtxt1)
        {
            var html = "<html dir=\"ltr\">\r\n<head>\r\n<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\">\r\n<meta content=\"text/html; charset=utf-8\">\r\n<base href=\"http://it.hcportal.ihess.com/itpmo\"><style>\r\n<!--\r\n.headertop1\r\n\t{width:100%}\r\n.headercontent\r\n\t{color:#000000;\r\n\tfont-family:verdana;\r\n\tfont-size:16pt}\r\n.headercontent em\r\n\t{font-weight:bold}\r\n.breadcrumb td\r\n\t{padding-left:2px;\r\n\tpadding-right:2px}\r\n.breadcrumb a\r\n\t{font-family:tahoma;\r\n\tfont-size:8pt}\r\n.content\r\n\t{margin-top:6px;\r\n\twidth:100%;\r\n\tborder-bottom:solid 1px #9ca3ad}\r\n.toolbar\r\n\t{border:1px solid #e8eaec;\r\n\tbackground-color:#f8f8f9;\r\n\tpadding-top:3px;\r\n\tpadding-bottom:6px;\r\n\tpadding-right:3px;\r\n\tpadding-left:3px}\r\n.toolbarbutton a, .toolbarsep\r\n\t{font-family:verdana;\r\n\tfont-size:.68em;\r\n\tpadding-left:3px;\r\n\tpadding-right:3px}\r\n.toolbarbutton a\r\n\t{text-decoration:none}\r\n.toolbarsep\r\n\t{color:#c7cbd1}\r\n.spacer\r\n\t{height:10px;\r\n\tfont-size:1px;\r\n\tline-height:1px}\r\n.formline, .noheight\r\n\t{height:1px;\r\n\tfont-size:1px;\r\n\tline-height:1px}\r\n.formlabel, .formbody, .digestlabel, .altdigestlabel, .deletedlabel, .altdeletedlabel\r\n\t{font-family:tahoma;\r\n\tfont-size:8pt;\r\n\tpadding:0px 7px 0px 7px;\r\n\tvertical-align:top}\r\n.formlabel, .digestlabel, .altdigestlabel, .deletedlabel, .altdeletedlabel\r\n\t{color:#616a76;\r\n\tfont-weight:bold}\r\n.rulerow\r\n\t{border-bottom:solid 1px #9ca3ad;\r\n\theight:0px;\r\n\tfont-size:1px;\r\n\tline-height:0px}\r\n.formbody\r\n\t{color:#000000}\r\n.edited\r\n\t{text-decoration:line-through;\r\n\tcolor:#9ca3ad}\r\n.descriptiontext\r\n\t{color:#9ca3ad;\r\n\tfont-family:tahoma;\r\n\tfont-size:8pt;\r\n\tpadding-top:5px;\r\n\tpadding-bottom:7px}\r\n.formline\r\n\t{border-bottom:1px solid #D7DEAC}\r\n.editedicon, .newicon, .deletedicon\r\n\t{color:#000000;\r\n\tfont-family:Small Fonts,Tahoma,Verdana,Sans Serif;\r\n\tfont-size:7pt;\r\n\tpadding-top:0px;\r\n\tpadding-right:3px;\r\n\tpadding-bottom:1px;\r\n\ttop:2px;\r\n\tmargin-right:8px;\r\n\tmargin-left:8px;\r\n\tfont-weight:normal}\r\n.editedicon\r\n\t{background-color:#ffffcc}\r\n.newicon\r\n\t{background-color:#b1faa2}\r\n.deletedIcon\r\n\t{background-color:#ffcccc}\r\n.messagespace\r\n\t{color:#5D6437;\r\n\tfont-family:tahoma;\r\n\tfont-size:8pt;\r\n\tpadding-top:5px;\r\n\tpadding-bottom:7px}\r\n.editedexample\r\n\t{background:#FFFFBF;\r\n\tpadding:1px}\r\n.vh, .vb, .altvb, .deleted, .altdeleted\r\n\t{font-weight:normal;\r\n\ttext-align:left;\r\n\ttext-decoration:none;\r\n\tvertical-align:top;\r\n\tfont-size:8pt;\r\n\tfont-family:tahoma,sans-serif;\r\n\tpadding-left:5px;\r\n\tpadding-right:8px}\r\n.vb, .altvb, .deleted, .altdeleted, .digestlabel, .altdigestlabel, .formlabel, .formbody\r\n\t{border-bottom:solid 1px #e8eaec;\r\n\tpadding-top:2px;\r\n\tpadding-bottom:5px}\r\n.vb div.nobr, .altvb div.nobr\r\n\t{white-space:nowrap}\r\n.vh\r\n\t{color:#76808e;\r\n\tfont-weight:bold;\r\n\tpadding-top:7px;\r\n\tpadding-bottom:6px;\r\n\twhite-space:nowrap}\r\n.vb, .altvb\r\n\t{color:#616a76}\r\n.altvb, .altdigestlabel, .altdeleted, .altdeletedlabel, .formlabel, .formbody\r\n\t{background:#f8f8f9}\r\n.digesttext\r\n\t{color:#000000}\r\n.deleted, .deletedlabel, .altdeleted, .altdeletedlabel\r\n\t{text-decoration:line-through;\r\n\tcolor:#9ca3ad}\r\n.deleted a, .altdeleted a\r\n\t{color:#9ca3ad;\r\n\ttext-decoration:line-through}\r\n-->\r\n</style>\r\n</head>\r\n<body>\r\n<table class=\"headertop1\" cellspacing=\"0\" cellpadding=\"0\">\r\n<tbody>\r\n<tr>\r\n<td class=\"headercontent\">\r\n<table class=\"breadcrumb\" cellspacing=\"0\" cellpadding=\"0\" width=\"100%\">\r\n<tbody>\r\n<tr>\r\n<td><a href=\"http://it.hcportal.ihess.com/itpmo\">IT PMO</a></td>\r\n</tr>\r\n</tbody>\r\n</table>\r\n<em>Global JV Accounting & JV Audit Team...</em> has been added </td>\r\n</tr>\r\n</tbody>\r\n</table>\r\n<table class=\"content\" cellspacing=\"0\" cellpadding=\"0\">\r\n<tbody>\r\n<tr>\r\n<td colspan=\"3\">\r\n<table class=\"toolbar\" cellspacing=\"0\" cellpadding=\"0\" width=\"100%\">\r\n<tbody>\r\n<tr>\r\n<td>\r\n<table cellspacing=\"0\" cellpadding=\"0\" border=\"0\">\r\n<tbody>\r\n<tr>\r\n<td class=\"toolbarbutton\"><a href=\"http://it.hcportal.ihess.com/itpmo/_layouts/15/MySubs.aspx\">Modify my alert settings</a></td>\r\n<td class=\"toolbarsep\">|</td>\r\n<td class=\"toolbarbutton\"><a href=\"http://it.hcportal.ihess.com/itpmo/Lists/IT Project Portfolio/DispForm.aspx?ID=1546\">View Global JV Accounting & JV Audit Team...</a></td>\r\n<td class=\"toolbarsep\">|</td>\r\n<td class=\"toolbarbutton\"><a href=\"http://it.hcportal.ihess.com/itpmo/Lists/IT Project Portfolio\">View Work Capture List</a></td>\r\n<td class=\"toolbarsep\">|</td>\r\n<td class=\"toolbarbutton\"><a href=\"http://it.hcportal.ihess.com/itpmo/_layouts/15/mobile/dispform.aspx?List=09DE8736-E6AF-4AB4-B452-3996693F305B&ID=1546\">Mobile View</a></td>\r\n</tr>\r\n</tbody>\r\n</table>\r\n</td>\r\n</tr>\r\n</tbody>\r\n</table>\r\n</td>\r\n</tr>\r\n<tr>\r\n<td colspan=\"3\" class=\"spacer\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Project Name:</td>\r\n<td class=\"formbody\">Global JV Accounting & JV Audit Team Spotfire reporting needs </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Description:</td>\r\n<td class=\"formbody\">\r\n<div class=\"ExternalClassBBDFEAB759A84CB79ABCDAFE409E645F\">\r\n<p>​Need of a summary dashboard to serve as a health check report</p>\r\n</div>\r\n </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Justification:</td>\r\n<td class=\"formbody\">\r\n<div class=\"ExternalClassECA99D876FB54C11935B728DF3114AA9\">\r\n<p>enhanced user experience</p>\r\n</div>\r\n </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Priority Group:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Start Date:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">End Date:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">ITLT Owner:</td>\r\n<td class=\"formbody\">Murray, Jason </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">IT Teams Involved:</td>\r\n<td class=\"formbody\">Spotfire COE </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Rough Order of Magnitude:</td>\r\n<td class=\"formbody\">Medium (161 - 500 person hours) </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Perceived Value:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Assets Impacted:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Functions Impacted:</td>\r\n<td class=\"formbody\">Other Corporate Function </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">State:</td>\r\n<td class=\"formbody\">Backlog </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Sponsored By:</td>\r\n<td class=\"formbody\">IT </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Project Sponsor:</td>\r\n<td class=\"formbody\">Larcombe, Nick </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Primary Driver:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Estimated Cost:</td>\r\n<td class=\"formbody\">< $50,000 </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Requested Date:</td>\r\n<td class=\"formbody\">3/31/2019 </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Project Submitted By:</td>\r\n<td class=\"formbody\">Pamarty, Krishna </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Technical Authority:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Supervisor:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Prioritization Forum:</td>\r\n<td class=\"formbody\">IT </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Date Constraint:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Problem Clearly Defined:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Alignment to Goal:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Stakeholders Engaged:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Readiness Score:</td>\r\n<td class=\"formbody\">0% </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Hess Standard Architecture Compatibility:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Process Impact:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Technical Complexity:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Support Capability:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Delivery Score:</td>\r\n<td class=\"formbody\">0% </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Relative Value:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Cost of Delay:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Probability of Success:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Value Score:</td>\r\n<td class=\"formbody\">0% </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Prioritization Score:</td>\r\n<td class=\"formbody\">0% </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Take Work Out Initiative:</td>\r\n<td class=\"formbody\">No </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Comments:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Priority:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">2019 IT Budget:</td>\r\n<td class=\"formbody\">No </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Enterprise-Wide Initiative:</td>\r\n<td class=\"formbody\">No </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Weekly Status Report:</td>\r\n<td class=\"formbody\">No </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Deliverables and Outcomes:</td>\r\n<td class=\"formbody\">\r\n<p>​<span aria-hidden=\"true\" id=\"ms-rterangepaste-start\"></span>SAP BI / Spotfire dashboard<span aria-hidden=\"true\" id=\"ms-rterangepaste-end\"></span></p>\r\n </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Project Duration:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Risks and Uncertanties:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Impacts:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Cost Center:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Technical Reviewer:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">IT AFE Amount:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Internal Costs:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">External Costs:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Baseline Impact:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Project Manager:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Current Status Summary:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Percent Complete:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">ITLT Approval Date:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Manager Approval Date:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">IT Budget:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">IT AFE Number:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Main Department:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">ITLT Review Recommended:</td>\r\n<td class=\"formbody\">No </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">ExpandSection1:</td>\r\n<td class=\"formbody\">No </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">ExpandSection2:</td>\r\n<td class=\"formbody\">No </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">ExpandSection3:</td>\r\n<td class=\"formbody\">No </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">ExpandSection4:</td>\r\n<td class=\"formbody\">No </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Manager:</td>\r\n<td class=\"formbody\"> </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td class=\"formlabel\">Solution:</td>\r\n<td class=\"formbody\">\r\n<div class=\"ExternalClass43F67F58AF0A4A9E82DDBA6AAE24B901\">\r\n<p>​</p>\r\n</div>\r\n </td>\r\n<td class=\"altvb\"> </td>\r\n</tr>\r\n<tr>\r\n<td colspan=\"3\" class=\"descriptiontext\">Last Modified 1/29/2019 2:49 PM by Chidhambaram, Vanniarajan</td>\r\n</tr>\r\n</tbody>\r\n</table>\r\n</body>\r\n</html>";
            html = Regex.Replace(html, @"^\s*$\n", string.Empty, RegexOptions.Multiline);
            var htmlDoc = new HtmlAgilityPack.HtmlDocument();
            htmlDoc.LoadHtml(html);
            //var htmlBody = htmlDoc.DocumentNode.SelectSingleNode("//body //table[@class='"+"content"+"']] //div[@class='"+"file_detail"+"'] //table[@class='"+"highlighttable"+"']");
            HtmlNode test = htmlDoc.DocumentNode.SelectSingleNode("//body //table[@class='" + "content" + "']");
            //HtmlNodeCollection rows =  htmlDoc.DocumentNode.SelectNodes("//body //table[@class='"+"content"+"'] //tr");

            string strFormLabel;

            //strFormLabel = test.SelectSingleNode("//tr[td[@class='"+"formlabel"+"']='Project Name:']/td[2]").InnerText;
            strFormLabel = htmlDoc.DocumentNode.SelectSingleNode("//body //table[@class='" + "headertop1" + "'] //tr[1] /td[1]").InnerText;
            bool btest = strFormLabel.Contains("has been added");

            //richTextBox1 จะใช้งานไม่ได้

            /*
              richTextBox1.WriteLine(btest);
              richTextBox1.WriteLine(HttpUtility.HtmlDecode(strFormLabel));
              richTextBox1.AppendText(HttpUtility.HtmlDecode(strFormLabel));
            */

            //...ใช้ rtxt1 ซึ่งเป็น control argument ที่เราเข้ามาแทน
            rtxt1.AppendText(HttpUtility.HtmlDecode(strFormLabel));

            //MessageBox.Show(HttpUtility.HtmlDecode(strFormLabel));
        }
        private void frmHtmlAgilityPack_Load(object sender, EventArgs e)
        {

        }
    }
}

RichTextBox rtxt1 = richTextBox1; // = คือ ถ่ายค่าจากขวาไปซ้าย