How to change home page in Internet Explorer using C#?

Question

Is it possible to change home page in Internet Explorer in C# application? Solution for other browsers (Firefox, Chrome) would be also nice.

Answer 1

Yes you can. The home page is stored in the registry. As long as your C# program has rights to modify the registry, you should be able to change this entry to any page you want.

IE

[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main]
“Start Page”=”http://www.yourwebsite.com/”

How to modify the Window Registry

How to set the default browser home page (IE) with C#?

FireFox

Firefox does not store the home page in the registry because it has different profiles under $APPDATA\Mozilla\Firefox\Profiles[profile name] The file you need to read from is prefs.js, and the line: user_pref("browser.startup.homepage", .... );

To get the default profile you need to read $APPDATA\Mozilla\Firefox\profiles.ini. You'll have to loop through each [Profile#] until Default=1 and you'll have your profile name from Path=...

If you want me to put this into a function (sounds like a good idea too) or if you'd like to make it, then get it up on the Wiki.

-Stu

Source

Untested code from experts-exchange

public static void SetMozilla(string strURL)
        {
            try
            {
                string strSystemUname = Environment.UserName.ToString().Trim();
                string systemDrive = Environment.ExpandEnvironmentVariables("%SystemDrive%");
                string strDirectory = "";
                string strPrefFolder = "";
                if (Directory.Exists(systemDrive + "\\Documents and Settings\\" + strSystemUname + "\\Application Data\\Mozilla\\Firefox\\Profiles"))
                {
                    strDirectory = systemDrive + "\\Documents and Settings\\" + strSystemUname + "\\Application Data\\Mozilla\\Firefox\\Profiles";
                }
                else if (Directory.Exists(systemDrive + "\\WINDOWS\\Application Data\\Mozilla\\Firefox\\Profiles"))
                {
                    strDirectory = systemDrive + "\\WINDOWS\\Application Data\\Mozilla\\Firefox\\Profiles";
                }
                if (strDirectory.Trim().Length != 0)
                {
                    System.IO.DirectoryInfo oDir = new DirectoryInfo(strDirectory);
                    //System.IO.DirectoryInfo[] oSubDir;
                    //oSubDir = oDir.GetDirectories(strDirectory);
                    foreach (DirectoryInfo oFolder in oDir.GetDirectories())
                    {
                        if (oFolder.FullName.IndexOf(".default") >= 0)
                        {
                            strPrefFolder = oFolder.FullName;
                            CreatePrefs(strURL, strPrefFolder);
                        }
                    }

                }
            }
            catch
            { }
        }
        private static void CreatePrefs(string strURL, string strFolder)
        {
            StringBuilder sbPrefs = new StringBuilder();
            sbPrefs.Append("# Mozilla User Preferences\n\r");
            sbPrefs.Append("/* Do not edit this file.\n\r*\n\r"); 
            sbPrefs.Append("* If you make changes to this file while the application is running,\n\r");
            sbPrefs.Append("* the changes will be overwritten when the application exits.,\n\r*\n\r"); 
            sbPrefs.Append("* To make a manual change to preferences, you can visit the URL about:config\n\r");
            sbPrefs.Append("* For more information, see http://www.mozilla.org/unix/customizing.html#prefs\n\r");
            sbPrefs.Append("*/\n\r");
            sbPrefs.Append("user_pref(\"app.update.lastUpdateTime.addon-background-update-timer\", 1188927425);\n\r");
            sbPrefs.Append("user_pref(\"app.update.lastUpdateTime.background-update-timer\", 1188927425);\n\r");
            sbPrefs.Append("user_pref(\"app.update.lastUpdateTime.blocklist-background-update-timer\", 1188927425);\n\r");
            sbPrefs.Append("user_pref(\"app.update.lastUpdateTime.search-engine-update-timer\", 1188927425);\n\r");
            sbPrefs.Append("user_pref(\"browser.anchor_color\", \"#0000FF\");\n\r");
            sbPrefs.Append("user_pref(\"browser.display.background_color\", \"#C0C0C0\");\n\r");
            sbPrefs.Append("user_pref(\"browser.display.use_system_colors\", true);\n\r");
            sbPrefs.Append("user_pref(\"browser.formfill.enable\", false);\n\r");
            sbPrefs.Append("user_pref(\"browser.history_expire_days\", 20);\n\r");
            sbPrefs.Append("user_pref(\"browser.shell.checkDefaultBrowser\", false);\n\r");
            sbPrefs.Append("user_pref(\"browser.startup.homepage\", \"" + strURL +"\");\n\r");
            sbPrefs.Append("user_pref(\"browser.startup.homepage_override.mstone\", \"rv:1.8.1.6\");\n\r");
            sbPrefs.Append("user_pref(\"browser.visited_color\", \"#800080\");\n\r");
            sbPrefs.Append("user_pref(\"extensions.lastAppVersion\", \"2.0.0.6\");\n\r");
            sbPrefs.Append("user_pref(\"intl.charsetmenu.browser.cache\", \"UTF-8, ISO-8859-1\");\n\r");
            sbPrefs.Append("user_pref(\"network.cookie.prefsMigrated\", true);\n\r");
            sbPrefs.Append("user_pref(\"security.warn_entering_secure\", false);\n\r");
            sbPrefs.Append("user_pref(\"security.warn_leaving_secure\", false);\n\r");
            sbPrefs.Append("user_pref(\"security.warn_submit_insecure\", false);\n\r");
            sbPrefs.Append("user_pref(\"security.warn_submit_insecure.show_once\", false);\n\r");
            sbPrefs.Append("user_pref(\"spellchecker.dictionary\", \"en-US\");\n\r");
            sbPrefs.Append("user_pref(\"urlclassifier.tableversion.goog-black-enchash\", \"1.32944\");\n\r");
            sbPrefs.Append("user_pref(\"urlclassifier.tableversion.goog-black-url\", \"1.14053\");\n\r");
            sbPrefs.Append("user_pref(\"urlclassifier.tableversion.goog-white-domain\", \"1.23\");\n\r");
            sbPrefs.Append("user_pref(\"urlclassifier.tableversion.goog-white-url\", \"1.371\");\n\r");
            StreamWriter writer = new StreamWriter(strFolder + "\\prefs.js");
            writer.Write(sbPrefs.ToString()); 
            writer.Close();
            writer.Dispose();
            GC.Collect();
        }

Source

CHROME

Programmatically access the Google Chrome Home or Start page

Other Sources

• http://www.howtogeek.com/howto/windows/registry-hack-to-set-internet-explorer-start-page/
• http://social.technet.microsoft.com/Forums/en/w7itproinstall/thread/0942e4c4-d8db-4f1a-b638-2550a8dbdbd9