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Code access security works in conjunction with Windows user account security. Therefore, when your application has permission according to CAS to access a protected resource, if your Windows user account does not have the privilege then the application will throw a permission exception.

Assume you have an interface implemented that is called ITradeService, as shown in Listing 8 1. Listing 8 1. ITradeService using using using using System; System.Collections.Generic; System.ServiceModel; System.Text;

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The most common security request type is the Demand type. They also, I think, make the most sense when implementing. Basically, the code protected by the declarative or imperative statement is demanding that the accessing code group have the permissions specified. When the code group has the permissions, the program continues to execute; if not, the CLR throws an exception. There are three types of demands; each addresses a different process for determining whether or not the demand is successful.

Dim expected As Integer = _ Convert.ToInt32(testContextInstance.DataRow("au_expected")) Dim actual As Integer actual = target.AddUser(userName, password) If userName = "Test User 2" Then _newUserId = actual End If Assert.AreEqual(expected, actual, _ "EffortTrackingServiceTests.localhost.Service.AddUser did " _ & "not return the expected value.") End Sub The DataSource attribute indicates to VSTS that an external data source is being used to drive this particular test method. The syntax for the DataSource constructor is Connection String, Table, Access Method. The connection string is a standard database connection string. The table is the table in the database that contains your test data, and the access method is how the test should access the data.

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You have already seen this type in action. You might not know that this form of demand ensures not only that the current code group has the demanded permission but also that all code groups down that call stack also have the required permission. This means that all assemblies in the call stack below the current call must also have the permissions demanded, not just the one currently executing. Be aware that the demand occurs every time the protected area is accessed because the stack might contain a different call stack. Therefore, if you call a declaratively protected method repeatedly or execute the imperative Demand method, a security check occurs each time. One unique implementation of imperative Demand syntax is to enable and disable controls in the UI so that a user does not have the ability to click on a control that he has no privileges for. You need to add the following to the CASSecurity.exe example to implement this: try { (gcnew FileIOPermission(FileIOPermissionAccess::Read, "C:\\"))->Demand(); } catch(Exception^) { bnReadFile->Enabled = false; } try { (gcnew FileIOPermission(FileIOPermissionAccess::Write, "C:\\"))->Demand(); } catch(Exception^) { bnWriteFile->Enabled = false; } I placed these lines in the Form1 constructor, but you can place them anywhere as long as they are executed before the controls are displayed. The results are shown in Figure 19-13.

namespace QuickReturns { [ServiceContract] public interface ITradeService { [OperationContract] string BeginTrade(); ... void Buy(); [OperationContract] void EndTrade(); } } The AddTrade and EndTrade parameters that are provided for the OperationContract attribute ensure that any sequence of invocations to the operation begin with the AddTrade method and complete with the CompleteDeal method. The client application invokes BeginTrade and then invokes AddTrade twice. It has a Buy method followed by an EndTrade method. Let s now assume that one of the AddTrade invocations never reaches the service. In this case, the service would still operate in a valid manner, and the application would not miss AddTrade. Similarly, consider a scenario in which both the invocations arrived at the destination. For whatever reason, one of them was delayed and arrived after CompleteDeal was invoked. The execution sequence would still execute in a valid manner. However, it would not be in the sequence intended by the client. Overcoming these problems is a fairly simple task. To begin, make the changes shown in Listing 8 2 to ITradeService in order to ensure that you do not have a scenario where messages could potentially be received out of order.

Note The access method has no effect on a unit test. The test will always be run using the sequential

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c# 4.0 - creating a pdf editor like application in c# - Stack Overflow
25 Mar 2013 ... How to write a PDF editor ? iText ® is a library that allows you to create and manipulate PDF ... iText is available in Java as well as in C# .

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