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Several types of validation are taking place on the customer form: Two RequiredFieldValidator controls make sure the user enters a user name and a password. A CompareValidator ensures that the two versions of the masked password match. A RegularExpressionValidator checks that the e-mail address contains an at (@) symbol. A RangeValidator ensures the age is a number from 0 to 120. A CustomValidator performs a special validation on the server of a referrer code. This code verifies that the first three characters make up a number that is divisible by 7.

Here s one good example of where the SqlDataSource is not the panacea you might have initially thought it was. The SqlDataSource is ideal when the query that you re executing is simple or more correctly, any parameters that you want to add to it are simple. It works well when all you need to do is find if x = 1 or y < 3, and so on. But it falls down when you need to use conditional statements

The tags for the validator controls are as follows:

Your site needs to know the Cart ID of your visitor s shopping cart to perform its shopping cart functionality. You ll create a property named shoppingCartId in the ShoppingCartAccess class, which returns the cart ID of the current visitor. It s important to understand how this latter property works.

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<asp:RequiredFieldValidator id="vldUserName" runat="server" ErrorMessage="You must enter a user name." ControlToValidate="txtUserName" /> <asp:RequiredFieldValidator id="vldPassword" runat="server" ErrorMessage="You must enter a password." ControlToValidate="txtPassword" /> <asp:CompareValidator id="vldRetype" runat="server" ErrorMessage="Your password does not match." ControlToCompare="txtPassword" ControlToValidate="txtRetype" /> <asp:RegularExpressionValidator id="vldEmail" runat="server" ErrorMessage="This email is missing the @ symbol." ValidationExpression=".+@.+" ControlToValidate="txtEmail" /> <asp:RangeValidator id="vldAge" runat="server" ErrorMessage="This age is not between 0 and 120." Type="Integer" MaximumValue="120" MinimumValue="0" ControlToValidate="txtAge" /> <asp:CustomValidator id="vldCode" runat="server" ErrorMessage="Try a string that starts with 014." ControlToValidate="txtCode" />

The form provides two validation buttons one that requires validation and one that allows the user to cancel the task gracefully. Here s the event handling code:

such as IN, and the parameter can t just be added to the query that you want to execute. In these cases, you need to massage the query and change the SelectCommand for the SqlDataSource. The first change that you ll notice is that the second SqlDataSource on the page has a ConnectionString, but it doesn t have a SelectCommand: <asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:SqlConnectionString %>"> </asp:SqlDataSource> This is perfectly valid, and all it means is that no data binding will take place when a Web control uses this as its data source no SelectCommand, no automatic data binding. So the page when it first loads won t connect to the database to try to show a list of Players in the GridView. In order for the automatic data binding to occur, you must add a SelectCommand. And this is exactly what you do in the Click event handler for the button on the page. The query is constructed in exactly the same way as you saw in the DataReader example. If the user has made a selection from the list, you have a query that you want to run, and you set the SelectCommand property: SqlDataSource2.SelectCommand = Query.ToString(); Once you ve set the SelectCommand to the query, you can let the automatic data binding occur. As you ll recall, this happens after the OnPreRender event, so as long as you ve set the SelectCommand before, you ll be able to rely on the automatic data binding. If no selection has been made, you don t want to run a query. So, you remove the SelectCommand by setting it to null: SqlDataSource2.SelectCommand = null; As there s no query to execute, the automatic data binding won t occur, thus clearing the GridView.

HTTP is, by its nature, a stateless protocol. Each individual client request is not associated with any previous requests from the same user. ASP.NET has a number of built-in features that overcome this problem, one of them being the session state that you ve already met earlier in this book. When it comes to identifying the visitor that browses your site and keeping track of the visitor s unique shopping cart, the first thing that comes to mind is cookies.

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