Answers for Day 7

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Sams Teach Yourself ASP.NET in 21 Days, Second Edition
By Chris Payne
Table of Contents
Appendix A.  Answers to Quiz Questions


Quiz

1:

What are the five Validation controls?

A1:

RequiredFieldValidator, CompareValidator, RangeValidator, RegularExpressionValidator, and CustomValidator.

2:

True or false: Validation controls are created on the client side.

A1:

False. Validation controls are created server-side, just like all other server controls.

3:

What two properties should every Validation control have?

A1:

ControlToValidate and ErrorMessage.

4:

What does the clienttarget=downlevel parameter do?

A1:

It makes ASP.NET believe you're developing for an older browser, disabling all DHTML events (including Validation controls).

5:

Assuming you have two server controls, tbName and tbAge, will the following validator work?

 <asp:CompareValidator runat="server"    ControlToValidate="tbName"    ValueToCompare="tbAge"    ErrorMessage="Error!"/> 
A1:

No, you should use ControlToCompare instead of ValueToCompare.

6:

What's the property you need to set for the CustomValidator control that specifies the event handler?

A1:

 OnServerValidate. 

Exercise

Q1:

Build a login page similar to Listing 7.7, but build it into a user control. Handle all validation inside the user control, as opposed to the containing ASP.NET page.

A1:

 1:    <script runat="server"> 2:       sub Submit(Sender as Object, e as EventArgs) 3:          if Page.IsValid then 4:             'do something 5:          end if 6:       end sub 7: 8:       sub ValidateThis(Sender as Object, args as _ 9:       ServerValidateEventArgs) 10:          if len(args.Value) < 8 then 11:             args.IsValid = false 12:          else 13:             args.IsValid = true 14:          end if 15:       end sub 16:    </script> 17: 18:          <asp:Label  runat="server" /> 19:          <table> 20:          <tr> 21:             <td valign="top">Username:</td> 22:             <td valign="top"> 23:                <asp:Textbox  runat="server" 24:                   /><br> 25:                <asp:CustomValidator runat="server" 26:                   OnServerValidate="ValidateThis" 27:                   OnClientValiate="validateLength" 28:                   Display="Dynamic" 29:                   ControlToValidate="tbUserName" 30:                   ErrorMessage="The username must be 8 characters or longer"/> 31:             </td> 32:          </tr> 33:          <tr> 34:             <td valign="top">Password:</td> 35:             <td valign="top"> 36:                <asp:Textbox  runat="server" 37:                   TextMode="password" /> 38:             </td> 39:          </tr> 40:          <tr> 41:             <td align="right" colspan="2"> 42:                <ASP:Button  runat="server" 43:                   OnClick="Submit" 44:                   text="Submit" /> 45:             </td> 46:          </tr> 47:    </table> 


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    Sams Teach Yourself ASP. NET in 21 Days
    Sams Teach Yourself ASP.NET in 21 Days (2nd Edition)
    ISBN: 0672324458
    EAN: 2147483647
    Year: 2003
    Pages: 307
    Authors: Chris Payne

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