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If you examine the Load event handler of the form-derived type (in other words, if you view the code for MainForm.cs and locate the MainForm_Load() method) you will find that the Fill() method of the custom table adapter is called upon startup, passing in the custom DataTable maintained by the custom DataSet: private void MainForm_Load(object sender, EventArgs e) { this.inventoryTableAdapter.Fill(this.inventoryDataSet.Inventory); } You can use this same custom data adapter object to update changes to the grid. Update the UI of your form with a single Button control (named btnUpdateInventory). Next, handle the Click event and author the following code within the event handler: private void btnUpdateInventory_Click(object sender, EventArgs e) { try { // Save changes with the Inventory table back to the database. this.inventoryTableAdapter.Update(this.inventoryDataSet.Inventory); } catch(Exception ex) { MessageBox.Show(ex.Message); } // Get fresh copy for grid. this.inventoryTableAdapter.Fill(this.inventoryDataSet.Inventory); } Run your application again; add, delete, or update the records displayed in the grid; and click the Update button. When you run the program again, you will find your changes are present and accounted for. Great! This example shows how helpful the DataGridView control designer can be. It lets you work with strongly typed data generates a majority of the necessary database logic on your behalf. The obvious problem is that this code is tightly connected to the window that uses it. Ideally, this sort of code belongs in your AutoLotDAL.dll assembly (or some other data access library). However, you might wonder how to harvest the code generated using the DataGridView s associated wizard in a Class Library project, given that there is no form designer by default.

Caution Enabling delegation for a server is something you should do carefully. Thoroughly review applications running on such a server, because malicious applications can lead to repudiation attacks. Imagine a malicious application (or malicious part of an application that has not been reviewed) running on this server and performing some illegal actions under an impersonated/delegated user s identity. Applications (and therefore servers) should be allowed only for performing delegation if it s really necessary so that applications running on such servers cannot do any illegal things based on other, impersonated/delegated user identities.

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Fortunately, you can activate the data design tools of Visual Studio 2010 from any sort of project (UIbased or otherwise) without the need to copy-and-paste massive amounts of code between projects. You can see this in action by adding more functionality to AutoLot.dll. This time, try copying the entire AutoLot (Version two) project folder you created earlier in this chapter to a new location on your hard drive and rename this folder to AutoLot (Version Three). Next, activate the Visual Studio 2010 File Open Project/Solution... menu option, and open the AutoLotDAL.sln file in your new AutoLot (Version Three) folder. Now, insert a new strongly typed DataSet class (named AutoLotDataSet.xsd) into your new project using the Project Add New Item menu option (see Figure 22-24).

The simplest form of impersonation is configured impersonation, where you use the webconfig file to define the impersonation behavior you want You accomplish this by adding the <identity> element shown here: <configuration> <systemweb> <!-- Other settings omitted --> <identity impersonate="true" /> </systemweb> </configuration> You can configure the identity element in more than one way, depending on the result you want If you want to impersonate the IIS authenticated account, you should use this setting: <identity impersonate="true"/> Keep in mind that if you allow anonymous access, you can use the IUSR_[ComputerName] account When using this approach, the impersonated account must have all the permissions required to run ASPNET code, including read-write access to the c:\[WinDir]\_MicrosoftNET\Framework\[Version]\Temporary ASPNET Files directory where the compiled ASPNET files are stored Otherwise, an error will occur and the page will not be served ASP.

This opens a blank Dataset Designer surface. At this point, you can use the Server Explorer to connect to a given database (you should already have a connection to AutoLot), and drag-and-drop each table and stored procedure you wish to generate onto the surface. In Figure 22-25, you can see each of the custom aspects of AutoLot are accounted for, and their relationships are realized automatically (this example does not drag over the CreditRisk table).

NET also provides the option to specifically set an account that will be used for running code This technique is useful if you want different ASPNET applications to execute with different, but fixed, permissions In this case, the user s authenticated identity isn t used by the ASPNET code It just sets a base level of permissions you want your application to have Here s an example: <identity impersonate="true" userName="matthew" password="secret" /> This approach is more flexible than changing the machineconfig account setting The machineconfig setting determines the default account that will be used for all web applications on the computer The impersonation settings, on the other hand, override the machineconfig setting for individual websites Unfortunately, the password for the impersonated account cannot be encrypted in the webconfig file by default.

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