.net upc-a reader

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Code running in one application cannot directly access code or resources from another application (Doing so could introduce a security hole) An exception to this rule is the base class library assembly of NET Framework Mscorlib which is shared by all application domains within the process Mscorlib is not shared between the processes Faults in one application cannot affect other applications by bringing down the entire process Each application has control over where the code loaded on its behalf comes from and what version the code being loaded is In addition, configuration information is scoped by the application The following examples describe scenarios in which it is useful to run multiple applications in the same process: ASP NET runs multiple Web applications in the same process.

In ASP and Internet Information Services (IIS), application isolation was achieved by process boundaries, which proved too expensive to scale appropriately it s cheaper to run 20 application domains in one process than to spawn 20 separate processes Microsoft Internet Explorer runs code from multiple sites in the same process as the browser code itself Obviously, code from one site should not be able to affect code from another site Database engines need to run code from multiple user applications in the same process Application server products might need to run code from multiple applications in a single process Hosting environments such as ASP NET or Internet Explorer need to run managed code on behalf of the user and take advantage of the application isolation features provided by application domains.

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In fact, it is the host that determines where the application domain boundaries lie and in what domain user code is run, as these examples show: ASP NET creates application domains to run user code Domains are created per application as defined by the Web server Internet Explorer by default creates one application domain per site (although developers can customize this behavior) In Shell EXE, each application launched from the command line runs in a separate application domain occupying one process Microsoft Visual Basic for Applications (VBA) uses the default application domain of the process to run the script code contained in a Microsoft Office document The Windows Foundation Classes (WFC) Forms Designer creates a separate application domain for each form being built When a form is edited and rebuilt, the old application domain is shut down, the code is recompiled, and a new application domain is created..

The standard ClientContext and GlobalContext properties, along with the GetClientContext() and GetGlobalContext() methods, provide access to the context data both publicly and to the clientside DataPortal. On the other end of the process, Csla.Server.DataPortal needs to take the values provided by the client and use them to set the slots on the server s Thread object or into the server s HttpContext. This is done by calling a SetContext() method: internal static void SetContext( HybridDictionary clientContext, HybridDictionary globalContext) { SetClientContext(clientContext); SetGlobalContext(globalContext); } This method simply sets both the values. This works even if the values passed from the client are null, ensuring that the server context is identical to that on the client. Similarly, Csla.Server.DataPortal needs to be able to clear the context on the server. It does this by calling a Clear() method: public static void Clear() { SetContext(null, null); } Clearing the context merely means that the context values from the client should be removed from the thread or HttpContext. The easiest way to do this is simply to set the values to null.

Although you can t override the Refresh Data When Opening the File setting, you can undo the refresh, after the file has opened, and before you perform any other tasks. Click the arrow on the Undo button, on the Quick Access Toolbar, and then click to undo any of the listed PivotTable Refresh actions (see Figure 7-3).

// get an IList and copy the data CopyData(dt, GetIList(source), columns); } The first thing this method does is get a list of column names (typically, the public properties and fields) from the data source It does this by calling a GetColumns() method (which will be covered later) Next, the target DataTable is checked to ensure that it has a column corresponding to every column name retrieved from GetColumns() If any columns are missing, they are added to the DataTable: foreach (string column in columns) if (!dtColumnsContains(column)) dtColumnsAdd(column); This ensures that all properties or fields from the data source have a column in the DataTable so they can be copied.

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