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A method can return a value to the calling code. The returned value is inserted into the calling code at the position in the expression where the invocation occurred. To return a value, the method must declare a return type before the method name. If a method does not return a value, it must declare a return type of void. The following code shows two method declarations. The first returns a value of type int. The second does not return a value. Return type int GetHour() { ... } void DisplayHour() { ... } No value is returned. A method that declares a return type must return a value from the method by using the following form of the return statement, which includes an expression after the keyword return. Every path through the method must end with a return statement of this form. return Expression; Evaluates to a value of the return type // Return a value.

Here are some of the advantages of using the presentation model:

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Figure 3-19. Consumption of resources while data binding The first hit you take on the web server s memory is when you call Fill on the DataAdpater. This marshals your entire result set from the database into the process space of the web server. The DataSet carries not only the current values as read from the database, but also the original values as the data was read out of the database, as well as metadata about the structure of the DataTable objects contained in its TablesCollection. The DataSet is a very powerful object, but it s also a very fat object. You take a hit whenever you load one into memory. If you re doing this on your home page, you re taking this hit not once, but once for each user that comes to your site. But wait, it gets worse. The next thing you do is set the DataSource of the DataGrid and call DataBind. As we just went over, this creates an in-memory collection of DataGridItems. This collection is probably just as large as your DataSet. If you re only outputting a couple of columns, maybe it won t be as large. If you re using a complex column template with a lot of markup, the size of this

WebPart zones Throughout the book so far we ve used WebPart zones extensively to provide a place where our web parts can live on a web page. We ve seen that web parts can be added to a WebPartZone control either at design time or dynamically at runtime. To allow web parts to be added at design time, the WebPartZone exposes a special ZoneTemplate to declare web parts within. An example of this is shown in listing 5.1:

11. After modifying the code, switch back to Design view. You will see the page in Design mode as shown in Figure 15-16. 12. Now open Input.aspx in your browser. You should see output similar to what is shown in Figure 15-17.

So far, we ve explicitly specified the array types at the beginnings of all our array declarations. But, like other local variables, your arrays can also be implicitly typed. This means the following: When initializing an array, you can let the compiler infer the array s type from the type of the initializers. This is allowed as long as all the initializers can be implicitly converted to a single type. Just as with implicitly typed local variables, use the keyword var instead of the array type.

If this event was raised, that means the user checked (or cleared) a checkbox somewhere in the TreeView, and what you need to do is find out which node just got checked, and check (or clear) the checkboxes of all of that node s subdirectories and files. The event handler passes in the sender object and an object of type TreeViewEventArgs. You can get the node that raised the event from this TreeViewEventArgs object (e). The Node itself has a property called Checked, which indicates whether the checkbox for that node is checked or cleared. You then call

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