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We re still retrieving all of the fields from the database even though we re only using two of them. Additionally, we re fetching all records from the database, not just the ones that meet our criteria. Also, we re not leveraging our indexes because we re ordering the results on the client. Ideally, we d like to issue a statement to the database like the following:

The DataContext, shown in figure 6.2, lies at the heart of LINQ to SQL and handles the majority of the work. First and foremost, it manages our connection to the database. We instruct the DataContext about the connection string. The DataContext will handle opening and closing the connection for us. As a result, we don t need to worry about abusing our expensive Figure 6.2 Services offered by the DataContext connection external resources. To begin working with the DataContext, create an instance of a DataContext object passing it the connection string for our database.

After generating the error, if you inspect the SQL Server error log, you ll find something similar to listing 8.

This program produces the following output:

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Mac OS X 10.4 adds support for access control lists (ACLs), a newer and more flexible way to control file permissions. Traditional Unix permissions are still in common use, though, and should be sufficient for most users.

Now you can test your interface, and you should see that the upper boxes hold their positions relative to the upper left corner, while the box containing the text view resizes along with the window. The layout for all our controls and other views is finally complete!

#define, 275 #elif, 275 #else, 275 #endif, 275 #if, 275 #line, 277 #pragma warning disable, restore, 278 #region, 277 #undef, 275 #warning, 277 += operator, 221 = operator, 221

Strictly speaking, you could have made the class stateless by passing the user credentials to the GetPermissions method, but we wanted to demonstrate how you can execute custom methods in a specific order. This expression will be executed before the expressions in the table region, and it can be safely used to initialize the custom code state. Because you are calling instance methods in the custom assembly, you reference the assembly in the Report Properties dialog box, as shown in figure 9.13. Before testing the report, don t forget to follow the steps for deploying the RsLibrary assembly and elevating its code access security to the Report Designer and Report Server folders, as we discussed in chapter 6. So far, you ve seen how to enforce secured access to the Report Server catalog based on the user s role membership. As we explained in chapter 6, developers can expand the report capabilities by using custom code. When this happens, you, as an

[RegularExpression("[MmFf]", ErrorMessage="Specify (M)ale or (F)emale, please")] public string Gender { get; set; }

Performing calculations on elements Let s look at one final example. We want a total price of all of the books in the inventory. This time, we ll use a slightly different query.

If the compiler tells you that No overload for method 'EndInvoke' takes 'X' arguments where X is the number of arguments you are attempting to use, it is likely because the parameters of the delegate are not declared as byref or ref. The compiler rightly assumes that it does not have to deal with values being returned if the parameter is not marked as a reference.

if ( myInt == 5 ) printf( "myInt is equal to 5" );

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