Data Annotation Properties--required

Required attribute can is applied to a property of a domain class. EF Code-first would create a not NULL column in a database table for a property on which we apply Required Attribu Te. Note that it can also is used with ASP. NET MVC as a validation attribute.

Consider the following example.

using System.ComponentModel.DataAnnotations; public class student{public  Student () {} public int studentid {get; set; } [ required]  Span class= "KWRD" >public   String Studentname { get;  set;}  } 

As can see in the above code, we had applied Required attribute to Studentname. So, Code first would create a not NULL studentname column in the Student table as shown below.

Data Annotation Properties--required