how to email verification in c#?

Question

Hello everyone,

 

I am working on MVC 5, I want to verify Email ID.

 

1) I am now validating email addres using jquery.

 

function isEmail(email) {
    var regex = /^([a-zA-Z0-9_.+-])+\@(([a-zA-Z0-9-])+\.)+([a-zA-Z0-9]{2,4})+$/;
    return regex.test(email);
}

 2) And checking the email id is existing or not inside database.

[HttpPost]
       public bool UserEmailIDExist(string emailid)
       {
           if (IsValidEmail(emailid) == true)
           {
               PartnerBIL partnerBIL = new PartnerBIL();
               return partnerBIL.SearchCompanyname(emailid);
           }
           else {
               return true;
           }
       }

       public bool IsValidEmail(string email)
       {
          /*Here, Which code I use for validate email id?*/
       }

  Also I want to verify the email id is valid online, how can I do that?

 

Please help me...