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Why Gaia Ajax?
The ASP.NET world needed a fast, lightfoot and intelligent library.
Gaia boosts your webapp development using C# or VB.NET and your existing ASP.NET knowledge. Gaia only sends what has changed back to the browser.
The result: a rich and responsive user experience.

Runs on ASP.NET

Gaia Ajax: How to create a simple Captcha

A Captcha is a type of challenge-response test used in computing to ensure that the response is not generated by a computer. This example shows how easy it is to build a simple Captcha control using Gaia Ajax. The features are not complete, and we have left it to you make it complete. The core of the sample is the Gaia Ajax DynamicImage control, which you will find in the user control.

First Name:
Last Name:

Retype the text on the image:

ASPX Markup
C# code
VB.NET

Markup (ASPX/.aspx)
  
     <table>
         <tr>
             <td>
                 First Name:
             </td>
             <td>
                 <gaia:TextBox ID="zFirstName" runat="server" />
                 <gaia:RequiredFieldValidator 
                     ID="zRequiredFieldValidator1" 
                     runat="server"
                     ControlToValidate="zFirstName">*</gaia:RequiredFieldValidator>
             </td>
         </tr>
         <tr>
             <td>
                 Last Name:
             </td>
             <td>
                 <gaia:TextBox ID="zLastName" runat="server" />
                 <gaia:RequiredFieldValidator 
                     ID="zRequiredFieldValidator2" 
                     runat="server"
                     ControlToValidate="zLastName">*</gaia:RequiredFieldValidator>
             </td>
         </tr>
         <tr>
             <td>
                 &nbsp;</td>
             <td>
                 &nbsp;</td>
         </tr>
         <tr>
             <td valign="bottom">
                 Retype the text<br />
                 on the image:</td>
             <td>
                 <uc1:Captcha 
                     ID="zCaptcha" 
                     runat="server" 
                     CaptchaLength="5" />
             </td>
         </tr>
         <tr>
             <td>
             </td>
             <td>
                 <gaia:Button ID="zSubmit" runat="server" OnClick="zSubmit_Click"
                     Text="Submit Form" /></td>
         </tr>
         <tr>
             <td>
             </td>
             <td>
                 <gaia:Label ID="zResult" runat="server"></gaia:Label></td>
         </tr>
     </table>
  