Validation ASP.Net Tutorial

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  4. Using the CustomValidator control to perform client-side validations
<%@ Page Language="C#" %>

    protected void Button1_Click(Object sender, EventArgs e) {
       Label1.Text = "VALID NUMBER!";
    }



    CustomValidator
    
        function validateNumber(oSrc, args) {
           args.IsValid = (args.Value % 5 == 0);
        }
    


    
    

        
            Number: 
                         Runat="server">
              
                         Runat="server" ControlToValidate="TextBox1" 
             ErrorMessage="Number must be divisible by 5" 
             ClientValidationFunction="validateNumber">
            
        
                         Runat="server" Text="Button">