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Creating a custom identity object that validates the user s credentials against the ASP.NET MembershipProvider component follows the same basic process I ve discussed thus far. The developer needs to create a custom principal and custom identity class as shown previously. However, CSLA .NET includes the MembershipIdentity class to simplify the process of validating the username and password against the ASP.NET security store. So instead of subclassing CslaIdentity, a developer can subclass MembershipIdentity because it already includes the code necessary to do the credential validation. This means creating a subclass that looks like this: [Serializable] public class CustomIdentity : MembershipIdentity { protected override void LoadCustomData() { // load roles and any custom properties here } } The MembershipIdentity base class takes care of validating the username and password but doesn t attempt to load any roles for the user. It does call the LoadCustomData() method shown here so the developer can override that method to load the user s roles and any other user-related data. By the time LoadCustomData() is invoked, the identity object is already loaded with the username, IsAuthenticated is true, and the identity object is essentially ready for use. If the user s credentials are invalid, no exception is thrown. Instead, an unauthenticated instance of MembershipIdentity is returned, with an IsAuthenticated value of false. In this case, the LoadCustomData() method is not invoked because the identity doesn t represent a valid user.

The Projects table will contain the data for each project in the system. The columns for this table are shown in Figure 6-19.

If your static content is offloaded from your web application servers, your web servers will have more capacity to handle incoming requests. The reduced load will reduce active connections, CPU use, and network traffic on the server.

You should now have an understanding of the difference between Windows and custom authentication. And you should understand how the BusinessPrincipalBase and various identity base classes can be used to create custom principal and identity objects that provide user and role information to .NET and CSLA .NET for authorization. In the rest of the chapter I discuss how CSLA .NET supports authorization at the type and property levels.

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The Id column is set up as the primary key, and it s of type uniqueidentifier, which is a Guid type in .NET. There are many ways to create primary key columns in tables, including using auto-incrementing numeric values or user-assigned values. However, the use of a uniqueidentifier is particularly powerful when working with object-oriented designs. Other techniques don t assign the identifier until the data is added to the database, or they allow the user to provide the value, which means that you can t tell if it collides with an existing key value until the data is added to the database. With a uniqueidentifier, however, the business developer can write code to assign the primary key value to an object as the object is created. There s no need to wait until the object is inserted into the database to get or confirm the value. If the value isn t assigned ahead of time, the database will supply the value. Notice that the two datetime fields allow null values. The null value is used here to indicate an empty value for a date. The Description column is also allowed to be null. This isn t because of any business requirement, but rather because it is quite common for database columns to allow null values in cases in which they re meaningless. 8 will illustrate how to easily ignore any null values in this column. The Description column is of type varchar(MAX), so that it can hold a blob of text data. This field allows the user to enter a lengthy description of the project, if so desired.

The largest bottleneck on web applications tends to be the time it takes to download static content from the web server, not the time it takes to serve the HTML page. Figure 10.11 shows the number of requests made to www.manning.com and the length of time it has taken for the content to be served. If you look carefully at figure 10.11, you ll see that it takes only 1.72 seconds to serve up the HTML page, but an additional 3.5 seconds to serve the static content. This extra time is used because most internet browsers (including Firefox and Internet Explorer) can download only two files simultaneously from the same domain. If more than two files are requested at the same time, all other requests from the same domain are queued. The graph in figure 10.12 shows that the .gif files from manning.com are being downloaded only two files at a time, but the files being served from google-analytics.com can be downloaded at the same time as the manning.com gifs.

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