How to validate optional email id field in mvc

Question

How to validate optional email id fields in mvc using data annotation. Please explain with example.

Ankit Sharma · Answer

Hi Arif You need to use Regular expresson to validate Email address and you need to remove [required] attribute as this field is optional. Please refer to this code [EmailAddress] [Display(Name = Email )] [RegularExpression(@ [a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])? )] public string Email{ get ; set ; } Please try and let me know if it works for you

Mohd Arif · Answer

Dear Mam I have a textbox which enter the email Id and works correctly. This textbox leaves empty my validation works correctly. I want to my textbox is empty validation do not works.When I enter the value in this textbox then validate properly. [Required] [EmailAddress] [Display(Name = Email)] public string Email { get; set; } This code not work for optional validation.

Ben Chris · Answer

You can either use front end validation using JQuery or you can use MVC built-in front end validation via Data Annotations. Usually both are used to ensure security at both front end and backend. Here is an example you can follow i.e. http://bit.ly/2gW3lPI For backend following simple line if code can be used i.e. [Required] [EmailAddress] [Display(Name = Email )] public string Email { get ; set ; }

Nilesh Patil · Answer

Hi Refer this tutorial http://www.c-sharpcorner.com/article/data-annotations-and-validation-in-mvc/