public static void Install(String machineConfigPath, String patchFileName)
        {
            ConfigXmlDocument machineConfig = new ConfigXmlDocument();

            machineConfig.PreserveWhitespace = true;
            machineConfig.Load(machineConfigPath);

            XmlDocument patch = new XmlDocument();

            patch.PreserveWhitespace = true;
            patch.Load(patchFileName);

            // Remove original <result type=""> node, replace by
            // comment.  Only one <result> node allowed in machine.config.
            String resultPath      = "/configuration/system.web/browserCaps/result";
            String browserCapsPath = "/configuration/system.web/browserCaps";

            XmlNode resultNode           = machineConfig.SelectSingleNode(resultPath);
            XmlNode browserCapsNode      = machineConfig.SelectSingleNode(browserCapsPath);
            XmlNode patchResultNode      = patch.SelectSingleNode(resultPath);
            XmlNode patchBrowserCapsNode = patch.SelectSingleNode(browserCapsPath);
            XmlNode patchResultNodeClone = machineConfig.ImportNode(patchResultNode, true);

            patchBrowserCapsNode.RemoveChild(patchResultNode);

            ArrayList browserCapsLeadingWhitespace = new ArrayList();

            foreach (XmlNode child in browserCapsNode.ChildNodes)
            {
                if (child.NodeType == XmlNodeType.Whitespace)
                {
                    browserCapsLeadingWhitespace.Add(child);
                }
                else
                {
                    break;
                }
            }

            StringBuilder commentText = new StringBuilder();

            if (resultNode != null)
            {
                XmlTextWriter commentWriter = new XmlTextWriter(new StringWriter(commentText));
                resultNode.WriteTo(commentWriter);
                browserCapsNode.RemoveChild(resultNode);
            }

            MergePrepend(machineConfig, patch,
                         "/configuration/system.web/httpModules");
            MergePrepend(machineConfig, patch,
                         "/configuration/configSections/sectionGroup[@name='system.web']");
            MergePrepend(machineConfig, patch,
                         "/configuration/system.web/compilation/assemblies");
            Merge(machineConfig, patch,
                  "/configuration/system.web/browserCaps");
            Insert(machineConfig, patch,
                   "/configuration/system.web", "mobileControls");
            Insert(machineConfig, patch,
                   "/configuration/system.web", "deviceFilters");

            // Prepend these nodes (in reverse order) so that they occur
            // before any other children.
            if (resultNode != null)
            {
                PrependComment(machineConfig, browserCapsNode, _removedEltEndComment);
                PrependComment(machineConfig, browserCapsNode, commentText.ToString());
                PrependComment(machineConfig, browserCapsNode, _removedEltBeginComment);
            }
            PrependComment(machineConfig, browserCapsNode, _endComment);
            browserCapsNode.PrependChild(patchResultNodeClone);

            // Clone formatting for inserted node.
            foreach (XmlNode child in browserCapsLeadingWhitespace)
            {
                browserCapsNode.PrependChild(child.CloneNode(false /* deep */));
            }
            PrependComment(machineConfig, browserCapsNode, _beginComment);

            // Clone formatting for uninstall.
            foreach (XmlNode child in browserCapsLeadingWhitespace)
            {
                browserCapsNode.PrependChild(child.CloneNode(false /* deep */));
                browserCapsNode.RemoveChild(child);
            }

            RemoveExtraWhitespace(machineConfig);

            StreamWriter s = new StreamWriter(machineConfigPath);
            XmlIndentAttributeTextWriter writer = new XmlIndentAttributeTextWriter(s);

            writer.Formatting  = Formatting.Indented;
            writer.Indentation = 4;
            machineConfig.Save(writer);
            writer.Flush();
            writer.Close();
        }