Declarative and Imperative Security

There are two ways to add security to your code.This can be a demand that callers have a specific permission, or a request for a specific permission from the CLR. The first method is declarative security, which can be set at assembly, class, and or member level, so you can demand different permissions at different places in the assembly. Permission demand at member level will only be effectuated, as this part of the code is actually called.The VB.NET syntax of declarative code is State)> for...

Querying XML Data Using XPath Document and XPath Navigator

The XmlDocument and the XmlDataDocument have certain limitations. First, the entire document needs to be loaded in the cache. Often, the navigation process via the DOM tree itself gets to be clumsy.The navigation via the relational views of the data tables might not be very convenient either. To alleviate these problems, XML.NET has provided the XPathDocument and XPathNavigator classes. These classes have been implemented using the W3C XPath 1.0 Recommendation (www.w3.org TR xpath). The...

Figure 514 XML Encryption DTD

PUBLIC - W3C DTD XMLSCHEMA 200010 EN http www.w3.org 2 0 00 10 XMLSchema.dtd < ATTLIST schema xmlns ds CDATA FIXED http www.w3.org 2 0 00 10 XMLSchema> < ENTITY enc http www.w3.org 2 0 0 0 11 temp-xmlenc> < ENTITY enc 'http www.w3.Org 2 00 0 11 xmlenc '> < ENTITY dsig 'http www.w3.org 2 0 00 0 9 xmldsig '> > < schema xmlns ds & dsig xmlns xenc & enc targetNamespace & enc version 0.1 < element name EncryptedData> < complexType> < sequence> < element ref...

Using the Xml DataDocument Class

The XmlDataDocument class is an extension of the XmlDocument class, and more or less behaves the same way the XmlDocument does. The most fascinating feature of an XmlDataDocument object is that it provides two alternative views of the same data, the XML view and the relational view. The XmlDataDocument has a property named DataSet. It is through this property that XmlDataDocument exposes its data as one or more related or unrelated DataTables. A DataTable is actually an imaginary table view of...

Figure 841 The webconfig File

lt add key ConnectionString User ID Admin Password gt lt add key XmlConfigFile gt lt appSettings gt Okay, now what exactly does that mean Your lt appSettings gt are custom settings you create and have access to in your application. We are creating two custom settings, which are added using the lt add gt tag.The key attribute is the name of the settings, and the value attribute is obviously the value. Here we are adding two keys, ConnectionString and XmlConfigFile. ConnectionString is what you...

Creating a New Permission

Suppose you decide that none of the seven built-in permissions sets satisfy your need for granting permissions.Therefore, you want to make a named permission set that does suit you.You have a few options Create a permission from scratch. Create a new permission set based on an existing one. Create a new permission from an XML-coded permission set. To get a better understanding of the working of the security policy and to get some hands-on experience with the tool, we discuss the different...

Creating the User Functions

Registered Users Members get a special set of functions they can access, such as creating threads and posts, editing their profile, and editing the messages they've posted. A Guest that is, an unregistered user is limited to a very small set of functionalities specifically, viewing the threads and messages Figure 8.58 . The next step in building our application's user interface is to allow a registered user to modify his or her member profile. This includes first name, last name, password, and...

Converting Binary Data Using Base64

In the previous section, you learned how the client application accesses the database residing on the server for processing data, and also about the role of ADO.NET as a bridge between the client application and the server. The data retrieved from the server by the client application was in the simplest form, being just plain text accompanied by some integer values. In addition, while submitting data back to the server, the client application was not allowed to send arbitrary data such as...

Locating an Assembly

Once the assembly is created, finished, and deployed, its scope is basically private in other words, the assembly will not in any way, shape, or form interfere with any other assemblies, DLL files, or settings that are not declared in the assembly's manifest. It's all part of CLR's automation it used to be that only VB coders had protection from memory leaks or other types of problems by inadvertently creating a program that went too far out of its area, but now, the CLR handles all that. Now,...

Using XPath Document and XPath Navigator Objects

In this section we will use the XPathDocument and XPathNavigator objects to load a list box from our Bank2.xml file as shown in Figure 6.24 .We will load a list box with the names of customers who are from Ohio. Figure 6.25 shows the output of this application. Figure 6.26 shows the complete code for this applica-tion.The code is also available in the XPathDocl.aspx file on the companion Solutions Web site for the book www.syngress.com solutions . Figure 6.25 Using the XPathDocument Object...

Using XPath Document and XPath Navigator Objects for Document Navigation

This section will illustrate how to search an XPathDocument using a value of an attribute, and using a value of an element.We will use the Bank3.xml to illustrate these. Figure 6.27 shows a partial listing of the Bank3.xml.The complete code is available on the companion Solutions Web Site for the book www.syngress.com solutions . lt Account AccountNo A1112 gt lt Name gt Pepsi Beagle lt Name gt lt Balance gt 12 00.8 9 lt Balance gt lt State gt OH lt State gt lt Account gt The Account element of...