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As in ADO, you should protect your code from unexpected errors when attempting a connection to a database as well as while processing data coming from the database itself. However, when working with ADO.NET you have an added responsibility: because of the garbage collection mechanism intrinsic in .NET, the connection isn t automatically closed when the Connection object goes out of scope. In this case, in fact, the connection is closed in the Finalize protected method of the Connection object, and you know that the garbage collector might call this method several minutes after the object goes out of scope. Because an error can occur virtually anywhere you re working in a database, you should protect your code with a Try block and ensure that you close the connection in the Finally section in an orderly way:

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5 The Extend And Create A Content Database page shown in Figure 13-19 will be next to appear. When it does, in the Application Pool section, select either of the following: Use An Existing Application Pool The newly extended virtual server will run in the same pool with other processes. This means your new SharePoint virtual server will share security and crash exposure with those processes.

Dim cn As New OleDbConnectionnString) Try cn.Open() Process the data here. Catch ex As Exception MessageBox.Show(ex.Message)

Other processes may have access to resources within your site. If another process brings down the pool, the SharePoint server you re extending will go down as well.

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Understanding tasks A task defines a set of permissions that can be enforced through role-based security. For example, RS defines a task called View Reports, which allows users to run reports. RE defines two types for tasks: system-level tasks and item-level tasks. System-level tasks represent maintenance actions, such as Define Roles. Item-level tasks define user permissions, such as View Reports, View Folders, and so on. Another way to differentiate between these two types is to note that system-level tasks work on global items (which do not have catalog paths), while item-level tasks work on items with paths. You can find the full list of predefined tasks under the Site Settings menu. Currently, RS doesn t support custom tasks. For this reason, you will not find a Task table in the Report Server database. In addition, you cannot map users directly to tasks. Instead, to use a task, you need to assign it to a role. Defining roles As its name suggests, the role-based security infrastructure in RS uses the concept of roles to assign a set of permissions to users with the same security requirements. Simply put, a role is a named set of tasks. Currently, RS doesn t support nested roles. For example, you cannot set up a Content Manager role to include the Browser role. Because the relationship between roles and tasks is many-to-many, the documentation uses the term role definition to represent the tasks-to-role membership. For example, RS includes the predefined item-level Browser and Content Manager roles, and both of them include the View Reports task.

Part V:

Create A New Application Pool The newly extended virtual server will run in its own pool. This is the recommended setting. However, if you choose this setting, you ll need to specify the name of the application pool, plus the user name and password that the pool will use. This user name is typically a domain account that has the Run As A Service right on the computer. However, it doesn t need to have database creation rights in SQL Server. The Central Administration server will create any necessary databases.

6 In the Site Owner section, type the site owner s username into the User Name text box. If this username belongs to a Windows domain, use the DOMAIN\username format.

Finally Ensure that the connection is closed. (It doesn t throw an exception even if the Open method failed.) cn.Close() End Try

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Strictly speaking, Reporting Services implements the roles-to-tasks relationship by a bit-masked value defined in the TaskMask column in the Roles table. For this reason, the terms role and role definition are interchangeable. However, I broke it down into two tables to make the concept easier to understand.

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