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Now, before we dig into the details, let me point out the fact that you will seldom if ever need to make use of pointer types. Although C# does allow you to drop down to the level of pointer manipulations, understand that the .NET runtime has absolutely no clue of your intentions. Thus, if you mismanage a pointer, you are the one in charge of dealing with the consequences. Given these warnings, when exactly would you need to work with pointer types There are two common situations: You are looking to optimize select parts of your application by directly manipulating memory outside the management of the CLR. You are calling methods of a C-based *.dll or COM server that demand pointer types as parameters. In the event that you do decide to make use of this C# language feature, you will be required to inform csc.exe of your intentions by enabling your project to support unsafe code. To do so using the C# command-line compiler (csc.exe), simply supply the /unsafe flag as an argument. From Visual Studio 2005, you will need to access your project s Properties page and enable the Allow Unsafe Code option from the Build tab (see Figure 9-4).

<user commonname="Roger" lastname="Wisky" email="r.wisky@apress.com" username="roger" password="998reh"/> </users> Finally, create the UserDaoTest.java class within the package you just created, as shown in Figure 9-8.

In the examples that follow, I m assuming that you have some background in C(++) pointer manipulations. If this is not true in your case, don t sweat it. Again, writing unsafe code will not be a common task for a majority of .NET applications. When you wish to work with pointers in C#, you must specifically declare a block of unsafe code using the unsafe keyword (as you might guess, any code that is not marked with the unsafe keyword is considered safe automatically): unsafe { // Work with pointer types here! } In addition to declaring a scope of unsafe code, you are able to build structures, classes, type members, and parameters that are unsafe. Here are a few examples to gnaw on: // This entire structure is 'unsafe' and can // be used only in an unsafe context. public unsafe struct Node { public int Value; public Node* Left; public Node* Right; } // This struct is safe, but the Node* members // are not. Technically, you may access 'Value' from // outside an unsafe context, but not 'Left' and 'Right'. public struct Node { public int Value; // These can be accessed only in an unsafe context! public unsafe Node* Left; public unsafe Node* Right; }

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c# add watermark to existing pdf file using itextsharp