Web Browser in Window Application C#

public Form1() {
    this.WindowState = System.Windows.Forms.FormWindowState.Maximized;
    InitializeComponent();
    webBrowser1.Url = new System.Uri("google.co.in", System.UriKind.Absolute);
    webBrowser1.ScriptErrorsSuppressed = true;
}

For Back Button

private void button3_Click(object sender, EventArgs e) {
    webBrowser1.GoBack();
}

For Forward Button

private void button4_Click(object sender, EventArgs e) {
    webBrowser1.GoForward();
}

For Go Button

private void button5_Click(object sender, EventArgs e) {
    webBrowser1.Navigate("google.com");
    webBrowser1.GoHome();
}

For Refresh Button

private void button6_Click(object sender, EventArgs e) {
    webBrowser1.Refresh();
}

For Open New Tab

private void tabControl1_MouseClick(object sender, MouseEventArgs e) {
    TabControl tc = (TabControl) sender;
    Point p = e.Location;
    int _tabWidth = 0;
    _tabWidth = this.tabControl1.GetTabRect(tc.SelectedIndex).Width - (_imgHitArea.X);
    Rectangle r = this.tabControl1.GetTabRect(tc.SelectedIndex);
    r.Offset(_tabWidth, _imgHitArea.Y);
    r.Width = 16;
    r.Height = 16;
    if (r.Contains(p)) {
        TabPage TabP = (TabPage) tc.TabPages[tc.SelectedIndex];
        tc.TabPages.Remove(TabP);
    }
}

For Close Opened Tab

void ToolStripButton_Click(object sender, EventArgs e)
{
    ToolStripButton t = (ToolStripButton)(sender);
    ToolStrip ts = t.Owner;
    TabPage tb = (TabPage)
        (ts.Parent);
    tabControl1.TabPages.Remove(tb);
}

For Add New Tab (By Button)

private void button2_Click(object sender, EventArgs e)
{
    ToolStrip ts = new ToolStrip();
    ts.Dock = DockStyle.Top;
    ts.RightToLeft = System.Windows.Forms.RightToLeft.Yes;
    ToolStripButton ToolStripButton = new ToolStripButton("X");
    ts.Items.Add(ToolStripButton);
    ToolStripButton.Click += new EventHandler(ToolStripButton_Click);
    TabPage addedTabPage = new TabPage("tab title");
    tabControl1.TabPages.Add(addedTabPage);
    tabControl1.SelectedTab = addedTabPage;
    addedTabPage.Focus();
    WebBrowser addedWebBrowser = new WebBrowser() {
        Parent = addedTabPage, //add the new webBrowser to the new tab
            Dock = DockStyle.Fill
    };
    addedWebBrowser.Navigate("www.google.com");
    tabControl1.TabPages[tabControl1.SelectedIndex].Controls.Add(ts);
}

For Go/Open Url (By Press Enter)

private void webBrowser1_Navigated(object sender, WebBrowserNavigatedEventArgs e) {
    textBox1.Text = webBrowser1.Url.ToString();
}
private void textBox1_KeyDown(object sender, KeyEventArgs e) {
    if (e.KeyCode == Keys.Enter) {
        Navigate(textBox1.Text);
    }
}
Check / Validate URL
private void Navigate(String address) {
    if (String.IsNullOrEmpty(address)) return;
    if (address.Equals("about:blank")) return;
    if (!address.StartsWith("http://") && !address.StartsWith("https://")) {
        address = "http://" + address;
    }
    try {
        webBrowser1.Navigate(new Uri(address));
    } catch (System.UriFormatException) {
        return;
    }
}

Auto Fill Form

private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e) {
        if (!is_sec_page) {
            // Text Box;
            webBrowser1.Document.GetElementById("txtFirstName").SetAttribute("value", "a"); //
            // Check Box;
            webBrowser1.Document.GetElementById("Search").SetAttribute("checked", "checked");
            // Drop Down list;
            webBrowser1.Document.GetElementById("ddlDis").Children[11].SetAttribute("selected", "selected");
            OR
            webBrowser1.Document.GetElementById("ddlDis").SetAttribute("value", "08");
            OR
            webBrowser1.Document.GetElementById("ddlDis").Children[12].SetAttribute("selected", "selected");
            //For Radio Button
            webBrowser1.Document.GetElementById("SearchBy").SetAttribute("checked", "checked");
            //webBrowser1.Document.GetElementById("txt_email").InnerText = "[email protected]";
            //For Invoke Button
            webBrowser1.Document.GetElementById("Button1").InvokeMember("click");
            OR
            HtmlElement submit = webBrowser1.Document.GetElementById("lnkNext");
            submit.InvokeMember("click");
            //is_sec_page = true;
        } else {
            //intract with sec page elements with theire ids and so on
        }
    }
    //For Auto Click on Pagination in Grid View
this.webBrowser1.Document.InvokeScript("__doPostBack", new object[] {
    "gvSearchResult",
    "Page$1"
});