How do I define the password rules for Identity in ASP.NET MVC

As you all know, the default Identity provider provided in ASP.NET MVC has very strict password rules by default, such as requiring lowercase character, uppercase character, non-alphanumeric character and a number.

To config the password rules you need open IdentityConfig.cs and then configure the password rules that you want.

// Configure validation logic for passwords
manager.PasswordValidator = new PasswordValidator
{
    RequiredLength = 3,
    RequireNonLetterOrDigit = false,
    RequireDigit = false,
    RequireLowercase = false,
    RequireUppercase = false
};

You can change login password length, digit, lowercase, upercase...