mardi 14 juillet 2015

Data Annotation Validation for a Group of Fields in Model

I am new to MVC 3 Data Annotations and I just want to ask that if its possible to add Validation on a Group of Fields in Model and Display the validation if none of it has Value?

this is the set of fields in my Data model

 public class ContactModel
        public Nullable<int> Id { get; set; }

        [Display(Name = "Contact Firstname")]
        [Required(ErrorMessage = "Required!")]
        public string ContactFirstname { get; set; }

        [Display(Name = "Contact Lastname")]
        [Required(ErrorMessage = "Required!")]
        public string ContactLastname { get; set; }

        [Display(Name = "Contact Middlename")]
        public string ContactMiddlename { get; set; }

            [Display(Name = "Phone")]
            [Required(ErrorMessage = "Required!")]
            public string ContactPhone { get; set; }

            [Display(Name = "Mobile ")]
            [Required(ErrorMessage = "Required!")]
            public string ContactMobile { get; set; }

            [Display(Name = "Email")]
            [Required(ErrorMessage = "Required!")]
            public string ContactEmail { get; set; }

        [Display(Name = "Job Title")]
        [StringLength(50, ErrorMessage = "Max character reached!")]
        public string ContactJobTitle { get; set; }


And I want to add validation if one from Phone,Mobile or Email doesn't have value


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