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PART III
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TextBox TextBox TextBox TextBox Button Table 15-3
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txtName txtEmail txtPassword txtPasswordRepeat btnSubmit
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The Properties for the Web Form
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Enter your full name Enter your e-mail address as name@domainxxx Enter your password Re-enter your password Click to submit information (Note: Set the Text property to Submit )
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Figure 15-6
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The finished ValidationExample form
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After adding the RequiredFieldValidator controls, you can run the application by pressing the F5 key Check that you are forced to enter data in every field Note,
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ControlToValidate
Text
ErrorMessage
valName valEmail valPassword valPasswordRepeat Table 15-4
txtName TxtEmail TxtPassword txtPasswordRepeat
* * * *
Your name is required The e-mail address is required You must enter a password Re-enter the password for verification
The Properties for the Validation Controls
15: Web Forms and User Interface
Value
(ID) ControlToValidate ErrorMessage Text ValidationExpression
valEmail1 txtEmail E-mail address must be in the format name@domainxxx * (Select Internet E-mail Address from the list The property will be set to the regular expression that validates an Internet e-mail address)
Table 15-5
Properties for the RegularExpressionValidator Control
however, that there is no validation that the e-mail address is correctly formed, nor does the application test that the password entries match In order to validate the format of the e-mail address, you can use a RegularExpression Validator control Start by adding a RegularExpressionValidator to the right of the valEmail control Set the properties for the validation control as listed in Table 15-5 The validation of the two password fields will be handled by a CompareValidator control To set this up, drag a new CompareValidator control to the right of the valPasswordRepeat control, and set the properties as in Table 15-6 You can now save and test the form (F5) As you can see, the red asterisk (*) indicates that there are errors or missing information in the fields; so while this application is very functional, you still do not see the error messages you entered into the validation controls To display the error messages, you can use a ValidationSummary control that will take all the error outputs from the validation controls and display them in a bulleted list To do so, simply drag a ValidationSummary control to the right of the current controls on the form That s all! You can change the look of the summary by changing the font and the style of the list, but the wiring is already done Figure 15-7 shows the application with a malformed e-mail address
PART III
Value
(ID) ControlToCompare ControlToValidate Display ErrorMessage Operator Text Table 15-6
valPasswordRepeat1 txtPassword txtPasswordRepeat Dynamic The passwords do not match Equal *
Properties for the CompareValidator
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Figure 15-7
The validation application with a malformed e-mail address
Some of the HTML code for the validation example is listed here We have not repeated all the controls in this sample for the full code listing, see the 15 directory on the CD
<%@ Page language="c#" Codebehind="WebForm1aspxcs" AutoEventWireup="false" Inherits="ValidationExampleWebForm1" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 40 Transitional//EN" > <HTML> <HEAD> <title>WebForm1</title> </HEAD> <body MS_POSITIONING="GridLayout"> <center><h1>Registrations</h1></center><br> <form id="Form1" method="post" runat="server"> <asp:Label id="Label1" style="Z-INDEX: 101; LEFT: 104px; POSITION: absolute; TOP: 80px" runat="server" ToolTip="Enter your full name">Name: </asp:Label>
15: Web Forms and User Interface
<asp:RequiredFieldValidator id="valPasswordRepeat" style="Z-INDEX: 116; LEFT: 320px; POSITION: absolute; TOP: 256px" runat="server" ErrorMessage="Re-enter the password for verification" ControlToValidate="txtPasswordRepeat">* </asp:RequiredFieldValidator> <asp:TextBox id="txtPasswordRepeat" style="Z-INDEX: 108; LEFT: 152px; POSITION: absolute; TOP: 256px" runat="server" TextMode="Password" ToolTip="Re-enter your password" tabIndex="4"> </asp:TextBox> <asp:Button id="btnSubmit" style="Z-INDEX: 109; LEFT: 152px; POSITION: absolute; TOP: 328px" runat="server" ToolTip="Click to submit information" Text="Submit"> </asp:Button> <asp:TextBox id="txtEmail" style="Z-INDEX: 106; LEFT: 152px; POSITION: absolute; TOP: 136px" runat="server" ToolTip="Enter your email address as name@domainxxx" tabIndex="2"> </asp:TextBox> <asp:RegularExpressionValidator id="valEmail1" style="Z-INDEX: 112; LEFT: 328px; POSITION: absolute; TOP: 136px" runat="server" ErrorMessage="Email address must be in the format name@domainxxx" ControlToValidate="txtEmail" ValidationExpression="\w+([-+]\w+)*@\w+([-]\w+)*\\w+([-]\w+)*">* </asp:RegularExpressionValidator> <asp:ValidationSummary id="valSummary" style="Z-INDEX: 114; LEFT: 392px; POSITION: absolute; TOP: 136px" runat="server"> </asp:ValidationSummary> </form> </body> </HTML>
PART III
Error Handling
Have you ever written code that does not run Code that inadvertently included optional features (aka bugs) that you did not intend to be in the application As a developer, you know that errors are in the nature of software In 4, we looked at exception handling; and in 9, we covered the art of debugging In this section, we will look at how to gracefully inform the user when things happen that you did not intend, or that result from missing resources, such as a database server being offline or a network router being down These types of runtime errors were not anticipated when the application was designed, and you must deal with them One of the most annoying errors we have seen is when connecting to a site, and after a long period the screen displays information that we do not have permission to access: "MSOLEDBSQL1;Data Source=Coporate1;Initial Catalog=Findata; User id=sa;Password=;" As users, we should never be given that information if
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