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Web Automation

, 26 Oct 2016 CPOL
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You can fill any form, click any button, and extract any data from web by using Web Automation.


Web Automation written in C#, using Web Browser control to automate many things. You can do many things by write JavaScript code to control a Web Browser.


You must know basic knowledge about JavaScript and C#, because Web Automation using JavaScript to communication with c# function.

How it work

This code bellow explain communication between JavaScript function and C# function, if you don't use it, when you call JavaScript to C# function it will not work.

// This nested class must be ComVisible for the JavaScript to be able to call it.
public partial class frmMain : Form

Then you create a Web Browser and a load JavaScript function on the Web Browser like in the code below on Form Load:

private void frmMain_Load(object sender, EventArgs e)
    wbMain = new WebBrowser();
    wbMain.ObjectForScripting = this;
    wbMain.DocumentText =
        "<html>" +
        "<head>" +
        "<script type='text/javascript'>" +
            "function go(url) " +
            "{ " +
                "window.external.go(url);" +
            "}" +
        "</script>" +
        "</head>" +
        "<body>" +
        "</body>" +

The code below has two important points, first ObjectForScripting and window.external:

The purpose of ObjectForScripting is for communication between JavaScript and the frmMain application, you can replace this by another class if you want, this class will be called from the JavaScript function.

I load the go function in Web Browser when loading the application, the purpose is when you execute script it will call function go in C#:

public void go(string url)

How you excute the script:

wbMain.Document.InvokeScript("eval", new object[] { "go('');" });  

When you excute script bellow, if function is JavaScript it will execute, if not it will find function you load from Web Browser, example function go, it not function JavaScript so that function will call, then window.external.go(url) will communicate with window application by ObjectForScripting and run function go(string url) and it will show dialog with message is '';

Combine all code and you will see how it is working:

using 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.Runtime.InteropServices;

namespace WebAutomation
    public partial class frmMain : Form
        private WebBrowser wbMain;

        public frmMain()

        private void frmMain_Load(object sender, EventArgs e)
            wbMain = new WebBrowser();
            wbMain.ObjectForScripting = this;
            wbMain.DocumentText =
                "<html>" +
                "<head>" +
                "<script type='text/javascript'>" +
                    "function go(url) " +
                    "{ " +
                        "window.external.go(url);" +
                    "}" +
                "</script>" +
                "</head>" +
                "<body>" +
                "</body>" +

        public void go(string url)

        private void btnRun_Click(object sender, EventArgs e)
            string code = tbxCode.Text;
            wbMain.Document.InvokeScript("eval", new object[] { code }); 


On my Application I using method "Call a C# Method From JavaScript Hosted in a WebBrowser" to control anything JavaScript cannot work like write file, open tab, working with file and folder...

Secure sensitive information like Account, User, Email Server, Connection by using "DotNet Zip Library" and "Secure Password Authentication".

Using "Mouse Key Board Library" to record and playback your mouse and your keyboard by script.

Recognize text from image by "Tesseract OCR", read and write excel file is "NPOI", Speech to Text is "Speech Recognition in C#".


Web Automation have four sections:

  1. Menu file will help you use some of feature of program like login, logout, register...,
  2. ToolBar menu will help you work with some item you will usually using like record, run,...,
  3. Web Browser will display website when you suffering,
  4. Developer Tools that place will automate every of program by JavaScript language

Using Web Automation to Login Gmail

Open program and enter link and click button go.

Right click every where on Web Browser, click Go then it show question "Do you want go to website?", if you choose yes it will get current URL you enter on the textbox, else it will get XPath of location where you right click then go to the link of the xpath.

Then it will show you Developer Tools with code JavaScript to control this function.

Right click on textbox username, click fill, enter username then click OK, repeat for password.

Right click on Button Login select click.

You must enter two line to ensure website load done before you continue, then you click Run and then program will go to Gmail for you.


What do you do with Web Automation?

Here is function of Web Automation, you can try by write function bellow with your parameter then click run and see what happen, notes some function need authentication to work like function number: 59 to 64, rest of another function you don't need to login.

  1. Open new tab: tabnew();
  2. Close current tab: tabclose();
  3. Go to website by url or xpath: go(url); or go(xpath);
  4. Go back: back();
  5. Go next: next();
  6. Reload browser: reload();
  7. Stop browser: stop();
  8. Wait until Web Browser has loaded or timer to wait Web Browser load: sleep(seconds, isBreakWhenWBCompleted)
  9. Close application: exit();
  10. Click to element: click(xpath);
  11. Write log to Preview Tab: log(value);
  12. Clear log write on Preview: clearlog();
  13. Extract data from xpath: extract(xpath);
  14. Fill data to element on Web Browser: fill(xpath, value);
  15. Select dropdown value: filldropdown(xpath, index);
  16. Convert string to Object javascript: toObject(xpath);
  17. Get all link in the area of xpath, it will stop until program go all of link : browser(xpath);
  18. Reset list website to unread so program can go back and browser continue : resetlistwebsite();
  19. Take snapshot of website: takesnapshot(url);
  20. Create folder: createfolder(path);
  21. Get list folder from path: getfolders(path);
  22. Create file: save(content, location, isOverride);
  23. Get list file from path: getfiles(path);
  24. Download a file: download(url, location);
  25. Read file: read(path);
  26. Remove file: remove(path);
  27. Remove folder: removefolder(path);
  28. Open explorer and select file: explorer(path);
  29. Run code from string: excute(code);
  30. Logoff: logoff();
  31. Lockworkstation: lockworkstation();
  32. Forcelogoff: forcelogoff();
  33. Reboot: reboot();
  34. Shutdown: shutdown();
  35. Hibernate: hibernate();
  36. Standby: standby();
  37. Run application: runcommand(path);
  38. Get current url of current tab: getcurrenturl();
  39. Get browser height: getheight();
  40. Get title of website: gettitle();
  41. Get all link from xpath: getlinks(xpath);
  42. Get content of web browser: getCurrentContent();
  43. Get path of Web Automation: getCurrentPath();
  44. Read cell of excel file: readCellExcel(path, sheetname, row, column);
  45. Write excel file: writeCellExcel(path, sheetname, cellname, value);
  46. Load HTML file: loadHTML(path);
  47. Convert json string to Object: textToJSON(jsonstring);
  48. Login: login(username, password);
  49. Register: register(username, email, password, confirm);
  50. OCR: ocr(path, language);
  51. Mouse Up: MouseUp(mouseButton, lastTime);
  52. Mouse Down: MouseDown(mouseButton, lastTime);
  53. Mouse Click: MouseClick(mouseButton, lastTime);
  54. Mouse Doble Click: MouseDoubleClick(mouseButton, lastTime);
  55. Mouse Move: MouseMove(x, y, isShow, lastTime);
  56. Mouse Wheel: MouseWheel(delta, lastTime);
  57. Key Down: KeyDown(delta, lastTime);
  58. Key Up: KeyUp(delta, lastTime);
  59. Get Account By: getAccountBy(name);
  60. Get Database: getDatabases(name);
  61. Get Tables: getTables(name, dbName);
  62. Get Columns: getColumns(name, dbName, table);
  63. Get Rows: getRows(name, dbName, sql);
  64. Execute SQL Query: excuteQuery(name, dbName, sql);

That all function of Web Automation, every function is JavaScript function so it have return or not return value, some time you get value is string, some time you will get value is object, it base on my C# function.

By combine each function together you can automate a lot of things, automate fill textbox, click button, extract any kind of data, automate create, delete, file, folder, automate extract data from website and save it to excel file easily, update data to excel file, read data from excel file, control your mouse, your keyboard.....

I try to include all knowledge I learn on my program like OCR, Text To Speech, Speech To Text,... My program can be expand by add function on JavaScript then add function on C# to solve some algorithm.


This is just one function of my software, in my software I give some technique to help automation better like record your mouse and keyboard it help automate some part not work on software, or control program by speech.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Đinh Công Thắng
Software Developer CSC Viet Nam
Vietnam Vietnam
I worked on Phoenix Software and CSC Viet Nam.
I have knowledge in C#, ASP.NET, Javascript, Jquery, Ajax, SQL Server, MVC 3.

My purpose want apply what I learn to real world, create utility so help another person don't repeat their work day by day, of course it not easy but I try and hope it good.

Google Plus:

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Comments and Discussions

QuestionDownloaded files Pin
Max Lambert27-Oct-16 3:30
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QuestionDownload Application Pin
Marcus196426-Oct-16 3:59
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AnswerRe: Download Application Pin
Đinh Công Thắng26-Oct-16 21:29
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GeneralRe: Download Application Pin
Max Lambert27-Oct-16 3:23
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GeneralRe: Download Application Pin
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QuestionNot able to read and write in excel file !! Pin
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AnswerRe: Not able to read and write in excel file !! Pin
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Questionhow to handle upload file or openfile dialogue box using this tool? Pin
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AnswerRe: how to handle upload file or openfile dialogue box using this tool? Pin
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QuestionFill input in iFrame Pin
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AnswerRe: Fill input in iFrame Pin
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QuestionHow to fix error sec_error_reused_issuer_and_serial and sec_error_unknown_issuer Pin
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QuestionRecompile the entire application from source code. Pin
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AnswerRe: Recompile the entire application from source code. Pin
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QuestionNeed to download excel file on button click which prompts to save or open file Pin
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AnswerRe: Need to download excel file on button click which prompts to save or open file Pin
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QuestionCustomizations Pin
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Generalapp to record Test case and record mouse movement and keyboard clicks Pin
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QuestionHow execute onclick event for each row in gidview? Pin
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