Figure 6-6 Controls That Can Be Used with Validation Controls in VS .NET

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Figure 6-6 Controls That Can Be Used with Validation Controls
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[ Team LiB ]
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Table of are available in ASPNET The RequiredFieldValidator, as we have seen already, Six validation controls Contents
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is used to verify that a field is not left empty The ValidationSummary control is used to display a Essential ASPNET with Examples in C#
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summary of ByFritz Onion all the error messages on a given form and optionally to display a client-side message box The
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CompareValidator control is used for comparing the value of one field to the value of another field (or a constant) The RangeValidator control is used to verify that a field value falls within a given range The Publisher : Addison Wesley RegularExpressionValidator control is used to verify the contents of a field against a regular Pub Date February 11, 2003 expression,:and finally the CustomValidator control is used for executing your own validation algorithms
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ISBN : 0-201-76040-1 Pages : 432 It is important to note that for all these controls except the RequiredFieldValidator, an empty field is
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considered valid Thus, it is common to combine the RequiredFieldValidator control with other validation controls to enforce both population and some other form of validation Table 6-1 shows the properties of each of the six validation controls and their associated values
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"This well-conceived and well-written book has extensive knowledge and priceless experience overflowing from its pages It captures the true essence of ASPNET and walks the reader to a high level of technical and architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom
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Table in C# is the C# Controls and Their Properties Essential ASPNET with Examples6-1 Validation programmer's definitive reference for ASPNET through version 11 It provides experienced programmers with the information needed to fully understand the Validation Control Values/Description technology, and is a clear guide to Properties using ASPNET to build robust and well architected Web applications
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RequiredFieldValidator This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how it builds on top of the NET framework Subsequent chapters explore the host of new features in ASPNET, CompareValidator Operator Equal, NotEqual, including the server-side compilation model, code-behind classes, server-side controls, form validation, the GreaterThan,GreaterThanEqual, data binding model, and custom control development Throughout the book, working examples illustrate LessThan, LessThanEqual, best practices for building Web-based applications in C# DataTypeCheck
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Among the topics explored in depth are: Type
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String, Currency, Date, Double, Integer
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Constant value to compare to Other control to compare to Constant value for upper bound Constant value for lower bound
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ASPNET architecture
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ValueToCompare ControlToCompare MaximumValue MinimumValue Type
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RangeValidator
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Configuration HTTP pipeline
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Web forms
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String, Currency, Date, Double, Integer
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Regular expression to validate against Server-side validation routine
RegularExpressionValidator Validation Expression Diagnostics and error handling CustomValidator
Validation
ServerValidate DisplayMode HeaderText ShowMessageBox ShowSummary
ClientValidationFunction Client-side validation routine BulletList, List, SingleParagraph
Title text of summary Display alert Display summary paragraph
ValidationSummary Data binding
Custom controls Caching State management
TheValidationSummary control culls all the ErrorMessages of each validation control on a page and
displays them [ Team LiB ] in a bullet list, a plain list, or a single paragraph format Listing 6-5 shows the ValidationSummary control and its additional properties The HeaderText property defines the title string for the summary of error messages The ShowMessageBox property causes a message box with the summary of errors to appear when the user tries to submit a form that has validation errors The ShowSummary property turns the summary on or off (you may want to turn it off if you elect to use the ShowMessageBox property) Finally, the DisplayMode property selects which of the three types of display you would like the summary to appear as Listing 6-5 shows an example of using the ValidationSummary control, along with two RequiredFieldValidator controls to validate the text inputs Listing 6-5 ValidationSummary Control Example
<! File: ValidationSummaryaspx > <html><body> <form runat=server> Table of Contents <table cellspacing=0 cellpadding=2 border=0> Essential ASPNET with Examples in C# border=0> <tr><td><table cellspacing=0 cellpadding=1 ByFritz <tr><td align=right><b>Name:</b></td> Onion <td><asp:TextBox id="cname" runat=server/></td> <td><asp:RequiredFieldValidator id="cnameValidator" Publisher : Addison Wesley ControlToValidate="cname" Pub Date : February 11, 2003 Display="Static" ISBN : 0-201-76040-1 ErrorMessage="Name must be filled in" Pages : 432 InitialValue="" runat=server>* </asp:RequiredFieldValidator> </td></tr> <tr><td align=right><b>Phone:</b></td> "This well-conceived and well-written book has extensive knowledge and priceless experience overflowing <td><asp:TextBox id="phone" runat=server/></td> from its pages It captures the true essence of ASPNET and walks the reader to a high level of technical and <td><asp:RequiredFieldValidator id="phoneValidator" architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom ControlToValidate="phone" Display="Static" Essential ASPNET with Examples in C# ismustC# programmer's definitive reference for ASPNET through ErrorMessage="Phone the be filled in" version 11 It provides experienced runat=server>* the information needed to fully understand the InitialValue="" programmers with technology, and is a clear guide to using ASPNET to build robust and well architected Web applications </asp:RequiredFieldValidator> </td></tr> This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how <tr><td></td> it builds on top of the NET framework Subsequent chapters explore the host of new features in ASPNET, <td><input value="Enter" type=submit /></td> including the server-side compilation model, code-behind classes, server-side controls, form validation, the </tr></table><td> data binding model, and custom control development Throughout the book, working examples illustrate <asp:ValidationSummary id="valSum" runat=server best practices for building Web-based applications in C# HeaderText="Please correct the following errors:" ShowMessageBox="True"/></td></tr> Among the topics explored in depth are: </table> </form> </body></html> ASPNET architecture
Web forms Listing 6-6 shows the CompareValidator control and its additional properties The Operator property defines what comparison operation to perform, and the Type property specifies the type of the two values to Configuration compare Either the ValueToCompare or the ControlToCompare property contains the value (or reference HTTP pipeline to a field containing the value) to compare with the target input Listing 6-6 shows an example of using the CompareValidator control to verify that the user is over 21 years of age Diagnostics and error handling