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The RangeValidator control verifies that an input value falls within a predetermined range. It has three specific properties: Type, MinimumValue, and MaximumValue. The last two define the range of valid values, while Type defines the type of the data that will be typed into the input control and validated. The available values are Currency, Date, Double, Integer, and String. The following example checks that the date entered falls within August 5 and August 20 (encoded in the form mm/dd/yyyy, so if your web server uses different regional settings, you ll have to change the date format): <asp:TextBox runat="server" ID="DayOff" /> <asp:RangeValidator runat="server" Display="dynamic" ControlToValidate="DayOff" Type="Date" ErrorMessage="Day Off is not within the valid interval" MinimumValue="08/05/2002" MaximumValue="08/20/2002">* </asp:RangeValidator>

Therefore, in addition to the usual , this method receives two arguments The actual class object of the model the field was assigned to This can be used to customize the field based on the name or other attributes of the model itself The name, as a string, of the attribute as it was assigned to the model s class Fields will typically store this away as an attribute of the field itself, for future reference..

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The CompareValidator control compares a value in one control with a fixed value or, more commonly, a value in another control. For example, this allows you to check that two text boxes have the same data or that a value in one text box doesn t exceed a maximum value established in another. Like the RangeValidator control, the CompareValidator provides a Type property that specifies the type of data you are comparing. It also exposes the ValueToCompare and ControlToCompare properties, which allow you to compare the value of the input control with a constant value or the value of another input control, respectively. You use only one of these two properties.

The Operator property allows you to specify the type of comparison you want to do. The available values are Equal, NotEqual, GreaterThan, GreaterThanEqual, LessThan, LessThanEqual, and DataTypeCheck. The DataTypeCheck value forces the validation control to check that the input has the required data type (specified through the Type property), without performing any additional comparison. The following example compares an input with a constant value in order to ensure that the specified age is greater than or equal to 18: <asp:TextBox runat="server" ID="Age" /> <asp:CompareValidator runat="server" Display="dynamic" ControlToValidate="Age" ValueToCompare="18" ErrorMessage="You must be at least 18 years old" Type="Integer" Operator="GreaterThanEqual">* </asp:CompareValidator> The next example compares the input values in two password text boxes to ensure that their value is the same: <asp:TextBox runat="server" TextMode="Password" ID="Password" /> <asp:TextBox runat="server" TextMode="Password" ID="Password2" /> <asp:CompareValidator runat="server" ControlToValidate="Password2" ControlToCompare="Password" ErrorMessage="The passwords don't match" Type="String" Display="dynamic"> <img src="imgError.gif" border="0" alt="The passwords don't match"> </asp:CompareValidator> This example also demonstrates another useful technique. The previous examples have used an asterisk (*) to indicate errors. However, this control tag uses an <img> tag to show a small image file of an exclamation mark instead.

The RegularExpressionValidator control is a powerful tool in the ASP .NET developer s toolbox. It allows you to validate text by matching against a pattern defined in a regular expression. You simply need to set the regular expression in the ValidationExpression property. Regular expressions are also powerful tools they allow you to specify complex rules that specify the characters, and in what sequence (position and number of occurrences) they are allowed, in the string. For example, the following control checks that the text input in the text box is a valid e-mail address: <asp:TextBox runat="server" ID="Email" /> <asp:RegularExpressionValidator runat="server" ControlToValidate="Email" ValidationExpression=".*@.{2,}\..{2,}" ErrorMessage="E-mail is not in a valid format" Display="dynamic">* </asp:RegularExpressionValidator> The expression .*@.{2,}\..{2,} specifies that the string that it s validating must begin with a number of characters (.*) and must contain an @ character, at least two more characters (the domain name), a period (escaped as \.), and, finally, at least two more characters for the domain extension. For example, marco@apress.com is a valid e-mail address, while marco@apress or marco.apress.com would fail validation. The proposed expression is quite simple in reality. Using a more complex regular expression, you could check that the domain name is valid, that the extension is not made up (see http://www.icann.org for a list of allowed domain name extensions), and so on. However, regular expressions obviously don t provide any way to check that a domain actually exists or is online.

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