Using Extended Validation of AJAX with ASP.Net Validate Control

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In this article, I will explain how to extend validation using AJAX of ASP.Net Validate Control.

  • Download Ajax Toolkit from http://www.asp.net
  • Open Visual Studio
  • Create new website
  • Create a webpage
  • Add some textboxes and button
  • Click on solution explorer
  • Right click
  • Add ASP.Net Folder
  • Select Bin
  • Bin Folder will be created
  • Right Click on Bin folder
  • Select Add Existing Item
  • Browse all binaries downloaded from website mentioned above
  • Add them
  • Now come to .aspx page
  • Add following code at top of the webpage
  • <%@ Register Assembly=”AjaxControlToolkit” Namespace=”AjaxControlToolkit” TagPrefix=”ajaxToolkit” %>
  • Now drag required field validator on textbox like
  • <asp:TextBox ID=”txt_degree_held” runat=”server” Width=”300px”></asp:TextBox>
  • <asp:RequiredFieldValidator ID=”RequiredFieldValidator1″ runat=”server” ControlToValidate=”txt_degree_held” ErrorMessage=”Required” SetFocusOnError=”True”></asp:RequiredFieldValidator>
  • Now add following code
  • <ajaxToolkit:ValidatorCalloutExtender ID=”ValidatorCalloutExtender1″ runat=”server” TargetControlID=”RequiredFieldValidator1″ HighlightCssClass=”blk”></ajaxToolkit:ValidatorCalloutExtender>
  • Now Build it by pressing CRTL+F5

Press button without inputting anything in text you will see out.

Explanation of Extender Control

  • ID represents its unique ID on the webpage
  • Runat obviously says this control will run on server
  • Target Control ID identifies which Validator to access
  • HighlightCssClass displays text according CSS property.

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