HtmlElementInsertionOrientation Enumeration

Defines values that describe where to insert a new element when using InsertAdjacentElement.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in

public enum HtmlElementInsertionOrientation
public enum HtmlElementInsertionOrientation
public enum HtmlElementInsertionOrientation

 Member nameDescription
AfterBeginInsert the element after the current element, but before all other content in the current element. 
AfterEndInsert the element after the current element, but after all other content in the current element. 
BeforeBeginInsert the element before the current element. 
BeforeEndInsert the element after the current element. 

The following code example inserts a DIV element into the top of every page that users view outside of the server. The example requires that your form contains a WebBrowser control named WebBrowser1. Your example must also import the namespace System.Text.RegularExpressions.

public void AddDivMessage()
    Uri currentUri = new Uri(webBrowser1.Url.ToString());
    String hostName = null;

    // Ensure we have a host name, and not just an IP, against which to test.
    if (!(currentUri.HostNameType == UriHostNameType.Dns))
        DnsPermission permit = new DnsPermission(System.Security.Permissions.PermissionState.Unrestricted);

        IPHostEntry hostEntry = System.Net.Dns.GetHostEntry(currentUri.Host);
        hostName = hostEntry.HostName;
    } else {
        hostName = currentUri.Host;

    if (!hostName.Contains(""))
        AddTopPageMessage("You are viewing a web site other than " +
            "Please exercise caution, and ensure your Web surfing complies with all " +
            "corporate regulations as laid out in the company handbook.");

private void AddTopPageMessage(String message)
    if (webBrowser1.Document != null) 
        HtmlDocument doc = webBrowser1.Document;

        // Do not insert the warning again if it already exists. 
        HtmlElementCollection returnedElems = doc.All.GetElementsByName("ADatumWarningDiv");
        if ((returnedElems != null) && (returnedElems.Count > 0)) 

        HtmlElement divElem = doc.CreateElement("DIV");
        divElem.Name = "ADatumWarningDiv";
        divElem.Style = "background-color:black;color:white;font-weight:bold;width:100%;";
        divElem.InnerText = message;

        divElem = doc.Body.InsertAdjacentElement(HtmlElementInsertionOrientation.AfterBegin, divElem);

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0