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Identifies the control that this validator will check Each validator can verify the value in one input control However, it s perfectly reasonable to stack validators in other words, attach several validators to one input control to perform more than one type of error checking If validation fails, the validator control can display a text message (set by the ErrorMessage property) By changing the ForeColor, you can make this message stand out in angry red lettering (In previous versions of ASPNET, the validation controls used red lettering by default But if you create a new application for ASPNET 4, your validation messages will use ordinary black text, unless you set the ForeColor property or use CSS styles in your page.

database) and the data in the query string. However, output caching doesn t work if the page output depends on user-specific information such as session data or cookies, because there s no way to vary caching based on these criteria. Output caching also won t work with dynamic pages that change their content in response to control events. In these situations, use fragment caching instead to cache a portion of the page, or use data caching to cache specific information. Both techniques are discussed later in this chapter.

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) Allows you to configure whether this error message will be inserted into the page dynamically when it s needed (Dynamic) or whether an appropriate space will be reserved for the message (Static) Dynamic is useful when you re placing several validators next to each other That way, the space will expand to fit the currently active error indicators, and you won t be left with any unseemly whitespace Static is useful when the validator is in a table and you don t want the width of the cell to collapse when no message is displayed Finally, you can also choose None to hide the error message altogether After validation is performed, this returns true or false depending on whether it succeeded or failed Generally, you ll check the state of the entire page by looking at its IsValid property instead to find out if all the validation controls succeeded.

Setting VaryByParam to the wildcard asterisk (*) is unnecessarily vague. It s usually better to specifically identify an important query string variable by name. Here s an example: <%@ OutputCache Duration="20" VaryByParam="ProductID" %> In this case, ASP.NET will examine the query string, looking for the ProductID parameter. Requests with different ProductID parameters will be cached separately, but all other parameters will be ignored. This is particularly useful if the page may be passed additional query string information that it doesn t use. ASP.NET has no way to distinguish the important query string parameters without your help. You can specify several parameters as long as you separate them with semicolons: <%@ OutputCache Duration="20" VaryByParam="ProductID;CurrencyType" %> In this case, ASP.NET will cache separate versions, provided the query string differs by ProductID or CurrencyType.

When set to false, automatic validation will not be performed for this control when the page is submitted If set to true, ASPNET will add JavaScript and DHTML code to allow client-side validation on browsers that support it..

The following example uses two web pages to demonstrate how multiple versions of a web page can be cached separately. The first page, QueryStringSender.aspx, isn t cached. It provides three buttons, as shown in Figure 24-3.

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