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As expected, when you click the button the page won t post if the text box is empty; and an asterisk (plus an optional message) is displayed to mark the error. This is because RequiredFieldValidator benefits the client-side capabilities of the browser and validates the input controls before proceeding with the post. Hence, in the case of empty text boxes, the button doesn t even attempt to make the post. Is that all, or is there more to dig out Let s work with a CustomValidator control, which instead requires that some server-side code be run to check the condition. Can you imagine the scenario You re on, say, crosspage.aspx and want to reach doSearch.aspx; to make sure you post only under valid conditions, though, you first need to make a trip to crosspage.aspx to perform some validation. Add this control, write the server validation handler in crosspage.aspx, and put a breakpoint in its code:

After restoring the key, you must restart Microsoft Internet Information Services (IIS) for the change to take effect.

<asp:CustomValidator ID="CustomValidator1" runat="server" Text="*" ControlToValidate="Keyword" OnServerValidate="EnsureValidKeywords" />

Or you can do everything with a single (but less readable) statement:

Debugging this sample page reveals that posting to another page is a two-step operation. First, a classic postback is made to run any server-side code registered with the original page (for example, server-side validation code or code associated with the click of the button). Next, the cross-page call is made to reach the desired page:

dtEmp.Constraints.Add(New UniqueConstraint(New DataColumn() _ {dtEmp.Columns( LastName ), dtEmp.Columns( FirstName )}))

void EnsureValidKeywords(Object source, ServerValidateEventArgs args) { args.IsValid = false; if (String.Equals(args.Value, "Dino")) args.IsValid = true; }

22:

The preceding code sets the page s IsValid property to false if the text box contains anything other than Dino. However, this fact alone doesn t prevent the transition to the target page. In other words, you could still have invalid input data posted to the target page. Fortunately, this issue has an easy workaround, as shown in the following code:

Visual Basic .NET supports all the conditional and loop statements supported by its predecessors that is, the If and Select conditional blocks and the For, Do, and While loop statements. Nevertheless, Visual Basic .NET offers some new features in this area as well, and Visual Basic .NET 2003 adds a new way to declare the controlling variable in For and For Each loops.

if (!PreviousPage.IsValid) { Response.Write("Sorry, the original page contains invalid input."); Response.End(); return; }

Important When using the rskeymgmt utility, you need to have local system administrator privileges on the server. This utility must be run locally on the server.

Short-circuit evaluation allows you to avoid the unnecessary evaluation of Boolean subexpressions if they wouldn t affect the value of the main expression. Let s see a sim ple example:

In the target page, you test the IsValid property on the PreviousPage property and terminate the request in the case of a negative answer. However, to avoid a server request and, worse yet, a page transition, you can add a client check to the CustomValidator control:

<asp:CustomValidator ID="CustomValidator1" runat="server" Text="*" ControlToValidate="Keyword" ClientValidationFunction="ensureValidKeywords" OnServerValidate="EnsureValidKeywords" />

3:

Here s a possible implementation of the JavaScript function:

If the n1 variable is 0 or negative, the entire expression can only be False, whether the subexpression following the And operator evaluates to True or False. Previous Visual Basic versions always evaluate the entire If expression, so they incur an unnecessary performance hit. Visual Basic .NET lets you produce smarter code using the new AndAlso and OrElse operators, which enforce short-circuit evaluation:

<script type="text/javascript"> function ensureValidKeywords(source, arguments) { arguments.IsValid = false; var buf = arguments.Value; if (buf == "Dino") arguments.IsValid = true; } </script>

This expression is equivalent to the following, more verbose, code: