fail System.ArgumentNullException: Value cannot be null.
Parameter name: address
   at System.Net.Mail.MailAddress..ctor(String address, String displayName, Encoding displayNameEncoding)
   at System.Net.Mail.MailAddress..ctor(String address, String displayName)
   at ASP._Page_Views_ContactForm_cshtml.Execute() in C:\Users\nefertum\salon-karma.hr\wwwroot\Views\ContactForm.cshtml:line 30