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Hey guys, I am Venkat and this is part 23 of web  development with blazor video series. In this   video we'll discuss how to create and use a custom  validation attribute in blazor. For most use cases   blazor has several built-in attributes for model  validation. We discussed some of these attributes   in part 22 of this video series. If you have a  complex validation requirement that you cannot   implement using the built-in attributes, you can  create a custom validation attribute and reuse   it in your project or even in multiple projects if  you create it in a separate class library project.   At the moment in our Employee class we already  have Email property decorated with [EmailAddress]   attribute, so if we try to edit an employee row  and provide an email address which is not valid,   we get validation error as expected. Now, here  is our new business requirement, you only want   to allow pragimtech.com as the email address  domain, if any other domain is provided maybe   something like gmail.com, we want to display a  validation error - only pragimtech.com is allowed   as the email domain. There are several ways to  implement this. For example, we can use a regular   expression validator to very easily implement  this, but let's create a custom validator.   In Blazor, to create a custom validator, we  create a class that derives from the built-in   ValidationAttribute abstract class, so in our  shared project in the utilities folder, let's   add a new class file, to keep it meaningful, let's  name our class file AllowedEmailDomainAttribute Let's make the class public, and remember,  to create a custom validation attribute,   we create a class that derives from the built-in  ValidationAttribute class, this class is present   in System.ComponentModel.DataAnnotations  namespace, so let's bring that in,   all we need to do inside this class is override  IsValid() method, notice, the moment we type   override and then press the spacebar, we see all  the methods that we can override, the method that   we want to override is this method which takes  two parameters - value and validationContext,   we don't need this line base.IsValid,  first let's check if value is null,   or value.ToString().Length = 0, basically we  are checking if an empty string is provided,   if a value for email address is not  provided, notice the return type of this   IsValid() method - ValidationResult, so let's  return a new instance of ValidationResult class,   and to this class we can pass the error message  that we want to display, in this case a value   for email address is not provided, so let's  display this message - Email address is required, else, a value for email address is provided, so  let's check, in the provided value if we have   an @ character, so value.ToString().IndexOf(),  and we want to find the index of @ character,   if that is equal to -1, that means we can't  find @ character in the provided email address,   again in this case also, we want to return an  instance of ValidationResult object, because   if...