Client side and server side validation



<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="Default_aspx" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<script language="javascript">
   function ClientValidator(source, args)
   {
      if (args.Value % 2 == 0)
         args.IsValid=true;
      else
         args.IsValid=false;
      return;
   }
</script>

    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
        <asp:TextBox ID="txtValue" runat="server"></asp:TextBox>
        <asp:Button ID="Button1" runat="server" Text="Submit" />&nbsp;&nbsp;
        <asp:CustomValidator 
             ControlToValidate="txtValue" 
             ValidateEmptyText=false
             ID="CustomValidator1" runat="server" 
             ClientValidationFunction="ClientValidator" 
             OnServerValidate="ServerValidator">
                Please enter an even number
        </asp:CustomValidator>
    
    </div>
    </form>
</body>
</html>

File: Default.aspx.cs

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Default_aspx : System.Web.UI.Page 
{
  protected void ServerValidator(object source, ServerValidateEventArgs e)
  {
    try
    {
      int evenNumber = Int32.Parse(e.Value);
      if (evenNumber % 2 == 0)
        e.IsValid = true;
    }
    catch (Exception)
    {
      // error handler here
    }
  }

}

Related examples in the same category

1.	CustomValidator: value length less than 100 (C#)
2.	Customvalidator Demo (VB.net)
3.	asp:CustomValidator validation (VB.net)
4.	asp CustomValidator: validate event function (C#)
5.	Define your own logic with CustomValidator

Client side and server side validation : CustomValidator « Validation by Control « ASP.Net

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