Non-validation on DateTime and other primitive types on ASP.NET MVC

Even you don't have any Required attribute on a value type property, i.e. primitive types and struct; ASP.NET MVC validation will still kick-in. You must make the field nullable

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public class SalesFilterViewModel {     public int CompanyId { get; set; } // will be required, even there's no Required attribute     public int? BranchId { get; set; } // will not be required           public DateTime? StartingDate { get; set; } // nullable, will not be required     public DateTime? EndDate { get; set; } // nullable, will not be required }

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// A true-false type of polling public class Poll {            public string QuestionId { get; set; }       // When a default value of false(when you don't make the bool nullable,     // it will default to false on page load) doesn't make sense,     // but an answer(either true or false) is still required, make the     // property nullable and add a Required attribute.     [Required]     public bool? YourAnswer { get; set; } }