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Although the session ID is protected from this point onward, the attacker now knows what session ID is in use and can hijack the session at a later time Taking certain steps can reduce the likelihood of this attack First, when using cookieless sessions, always regenerate ExpiredSessionId to True This prevents the attacker from supplying a session ID that s expired Next, explicitly abandon the current session before logging in a new user..

str.Append(node.Name); str.Append(" "); str.Append(node.Value); str.Append("</b><br />"); break; case XmlNodeType.Element: str.Append(indent); str.Append("Element: <b>"); str.Append(node.Name); str.Append("</b><br />"); break; case XmlNodeType.Text: str.Append(indent); str.Append(" - Value: <b>"); str.Append(node.Value); str.Append("</b><br />"); break; case XmlNodeType.Comment: str.Append(indent); str.Append("Comment: <b>"); str.Append(node.Value); str.Append("</b><br />"); break; } ... Note that not all types of nodes have a name or a value. For example, for an element such as Title, the name is Title, but the value is empty, because it s stored in the following Text node. Next, the code checks whether the current node has any attributes (by testing if its Attributes collection is null). If it does, the attributes are processed with a nested foreach loop: ... if (node.Attributes != null) { foreach (XmlAttribute attrib in node.Attributes) { str.Append(indent); str.Append(" - Attribute: <b>"); str.Append(attrib.Name); str.Append("</b> Value: <b>"); str.Append(attrib.Value); str.Append("</b><br />"); } } ... Lastly, if the node has child nodes (according to its HasChildNodes property), the code recursively calls the GetChildNodesDescr function, passing to it the current node s ChildNodes collection and the current indent level plus 1, as shown here: ... if (node.HasChildNodes) str.Append(GetChildNodesDescr(node.ChildNodes, level+1)); } return str.ToString(); } When the whole process is finished, the outer foreach block is closed, and the function returns the content of the StringBuilder object.

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Before you can use cookies, you should import the System.Net namespace so you can easily work with the appropriate types, as shown here: using System.Net; Cookies are fairly easy to use. Both the Request and Response objects (which are provided through Page properties) provide a Cookies collection. The important trick to remember is that you retrieve cookies from the Request object, and you set cookies using the Response object. To set a cookie, just create a new System.Net. HttpCookie object. You can then fill it with string information (using the familiar dictionary pattern) and attach it to the current web response, as follows: // Create the cookie object. HttpCookie cookie = new HttpCookie("Preferences"); // Set a value in it. cookie["LanguagePref"] = "English"; // Add it to the current web response. Response.Cookies.Add(cookie); A cookie added in this way will persist until the user closes the browser and will be sent with every request. To create a longer-lived cookie, you can set an expiration date, as shown here: // This cookie lives for one year. cookie.Expires = DateTime.Now.AddYears(1); Cookies are retrieved by cookie name using the Request.Cookies collection, as shown here: HttpCookie cookie = Request.Cookies["Preferences"]; // Check to see whether a cookie was found with this name. // This is a good precaution to take, // because the user could disable cookies, // in which case the cookie would not exist. string language; if (cookie != null) { language = cookie["LanguagePref"]; } The only way to remove a cookie is by replacing it with a cookie that has an expiration date that has already passed. The following code demonstrates this technique: HttpCookie cookie = new HttpCookie("LanguagePref"); cookie.Expires = DateTime.Now.AddDays(-1); Response.Cookies.Add(cookie);

Application state allows you to store global objects that can be accessed by any client. Application state is based on the System.Web.HttpApplicationState class, which is provided in all web pages through the built-in Application object.

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